Outlook 365 / 2021 / 2019 / 2016 Update for February 2024

News

The February security and rollup update has been made available for all Click-to-Run installations of Outlook 2016, Outlook 2019, Outlook 2021 and Outlook as part of a Microsoft 365 subscription.

It contains 6 security updates for Outlook (2), Visio (1), Word (1), and Office (2). The details about the Outlook vulnerabilities can be found below;

  • CVE-2024-21378: Microsoft Outlook Remote Code Execution Vulnerability
    • This vulnerability is currently not publicly disclosed nor exploited.
    • Exploitation of the vulnerability requires that a user open a specially crafted file.
    • The Preview Pane is an attack vector.
    • The Exploitability Assessment is rated: Exploitation More Likely.
  • CVE-2024-21402: Microsoft Outlook Remote Code Execution Vulnerability
    • This vulnerability is currently not publicly disclosed nor exploited.
    • If the attacker successfully exploits the vulnerability, the attacker would gain the rights of the user that is running the affected application.
    • The Exploitability Assessment is rated: Exploitation Less Likely.

In addition, it contains 1 non-security fix related to Outlook Current Channel Version 2401, and 7 fixes related to Outlook Monthly Enterprise Version 2312.

  • 2401
    • We fixed an issue where the App Search bar was unexpectedly appearing above the message list in Outlook 2016 and Outlook 2019.
  • 2312
    • We fixed an issue that caused Outlook to exit unexpectedly when opening embedded mail attachments in another application.
    • We fixed an issue where the list of invalid recipients was showing duplicates.
    • We fixed an issue where Mail Tips were not showing for attachments.
    • We fixed an issue that caused Data Loss Prevention features to be unexpectedly disabled when disabling Optional Connected Experiences.
    • We fixed an issue where Skype for Business was shutting down unexpectedly at start up.
    • We fixed an issue where the message list was blank when switching between the “Focused” and “Other” views.
    • We fixed an issue that caused Outlook to exit unexpectedly after discarding an edit to a received single instance meeting.

Based on your release channel, you’ll be updated to the following version;

  • Microsoft 365 Apps, Outlook 2016 Retail, Outlook 2019 Retail, Outlook 2021 Retail
    Version 2401 (Build 17231.20236)
  • Monthly Enterprise
    Version 2312 (Build 17126.20190)
    Version 2311 (Build 17029.20178)
  • Semi-Annual Enterprise (Preview)
    Version 2308 (Build 16731.20550)
  • Semi-Annual Enterprise
    Version 2308 (Build 16731.20550)
    Version 2302 (Build 16130.20916)
    Version 2208 (Build 15601.20870) 
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20637)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10407.20032)

Note: Depending on your installation type, this update can be installed via the Update Now button in Outlook itself or the Microsoft Store. This update does not apply to msi-based installations of Office 2016.


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Exchange 2019 CU14

News

Cumulative Update 14 for Exchange 2019 is now available. With the new release model, it is officially called; The 2024 H1 Cumulative Update (CU) for Exchange Server 2019.

Exchange 2019 CU14 includes the following major changes;

There are 18 additional fixes documented for this release. A few notable ones are;

  • KB5035443: Read receipts are returned if ActiveSyncSuppressReadReceipt is “True” in Exchange Server 2019
  • KB5035453: Issues in Exchange or Teams when you try to delegate information
  • KB5035455: MSExchangeIS stops responding and returns “System.NullReferenceExceptions” multiple times per day
  • KB5035494: Modern attachment doesn’t work when web proxy is used in Exchange Server 2019
  • KB5035495: OWA displays junk operations even if junk mail reporting is disabled
  • KB5035542: Remote equipment and room mailboxes can now be managed through EAC
  • KB5035617: Transport rules aren’t applied to multipart or alternative messages

This release does not include new updates to the Active Directory Schema for Exchange 2019.

Exchange 2019 is scheduled for later this year and will include support for TLS 1.3.

Exchange 2019: CU14 KB5035606Download
View: Blog post of the Exchange Team about CU14 for Exchange Server 2019

Note: Exchange 2016 has reached its Extended Support phase and CU23 was the last CU for it. This means that from now on, it will only receive Security Updates.


Outlook 2016 (MSI) Security Update for February 2024

News

A Security Update has been released for Outlook 2016. It resolves the following vulnerability;

  • CVE-2024-21378: Microsoft Outlook Remote Code Execution Vulnerability
    • This vulnerability is currently not publicly disclosed nor exploited.
    • Exploitation of the vulnerability requires that a user open a specially crafted file.
    • The Preview Pane is an attack vector.
    • The Exploitability Assessment is rated: Exploitation More Likely.

View: Download information for KB5002543

Note: This update can be installed via Microsoft Update and updates Outlook to version 16.0.5430.1000. This update does not apply to Perpetual (Retail) and Microsoft 365 based installations of Office 2016.


Outlook for Microsoft 365 Apps Feature Update for January 2024

News

Microsoft has released the January 2024 feature update of Outlook for Microsoft 365 Apps in the Current Channel.

However, this time there is not a single new feature for any of the Office applications but just a couple of fixes.

There is 1 only fix for Outlook and 1 fix for OneNote that is also related to Outlook.

  • We fixed an issue that caused Outlook to exit unexpectedly after discarding an edit to a received single instance meeting.
  • We fixed an issue where meetings spanning a full day were appearing in meeting details on the following day. (OneNote)

Note: Depending on your installation type, this update can be installed via the Update Now button in Outlook or the Microsoft Store and updates Outlook to: Version 2401 (Build 17231.20182).


Outlook 365 / 2021 / 2019 / 2016 Update for January 2024

News

The January security and rollup update has been made available for all Click-to-Run installations of Outlook 2016, Outlook 2019, Outlook 2021 and Outlook as part of a Microsoft 365 subscription.

It contains 1 security update for shared Office components. After applying this update, you can no longer insert FBX files (3D models) into Office documents and emails. Substitutes and workarounds are available.

There were no additional non-security fixes released to any of the already available Channels. There is also no new Monthly Enterprise Channel release and note that support for Version 2309 has ended.

However, Version 2308 has now also been released to the Semi-Annual Enterprise Channel and contains 12 highlighted new features and 49 fixes for Outlook (including 4 via Word and 1 via shared Office components) which have been made available already to the other release channels. The new feature are;

  • Inheritance of attachment labels to email messages
    For email messages with attachments, apply a label that matches the highest classification of those attachments.
  • Prevent data leaks more easily with the new Sensitivity toolbar
    Sensitivity labels powered by Microsoft Purview Information Protection are now displayed next to the message Subject line, allowing you to easily recognize and adhere to your organization’s policies.
  • Block emails with sensitive labels
    Implement pop-up messages in Outlook that warn, justify, or block emails being sent based on sensitivity labels.
  • Disable the Azure Information Protection Add-in by default
    Office apps will now automatically disable the legacy Azure Information Protection add-in and use the built-in sensitivity labels to view and apply labels powered by Microsoft Purview Information Protection.
  • Assign a sublabel as the default when a parent label is selected
    When using built-in sensitivity labels in Microsoft 365 Apps, admins can specify a sublabel to get applied automatically when a parent label is selected. This takes effect only when users select a parent label manually.
  • Same signature, all devices with Outlook for Windows
    Your signature is stored in the cloud. Create it once and use it everywhere you use Outlook for Windows.
  • Enabling Bookings Meta OS app in Win32
    Replacing the existing Bookings app with new app for Meta OS in Win32.
  • Accessibility Ribbon in Outlook for Windows
    The Accessibility Ribbon brings together in one place all the tools you need to make your emails accessible.
  • Get relevant alerts with new Notifications pane
    Don’t let important information get buried in your inbox. The new Notifications pane in Outlook delivers notifications that are relevant to you in the context of your regular email. The pane gives you the ability to customize the types of notifications you wish to receive, including email and document @mentions, travel updates, deliveries, and more.
  • Reactions
    This feature allows users to apply emotive reactions (e.g., , ♥, ) to email messages and see what reactions have been applied by other people as well.
  • We added a registry key that hides the “Try the new Outlook” toggle
    To learn more about the new Outlook for Windows, please click here. For additional information on managing mailbox access to the new Outlook for Windows, please click here.
    • Key: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General
    • Value name: HideNewOutlookToggle
    • Value type: REG_DWORD
    • 0 (default) – “Try the new Outlook” toggle, if available in selected update channel, is displayed to users.
      1 – “Try the new Outlook” toggle is hidden.
  • Org Explorer
    Visualize and explore your company’s internal structure, work teams, and individual roles.

Based on your release channel, you’ll be updated to the following version;

  • Microsoft 365 Apps, Outlook 2016 Retail, Outlook 2019 Retail, Outlook 2021 Retail
    Version 2312 (Build 17126.20132)
  • Monthly Enterprise
    Version 2310 (Build 16924.20202) 
  • Semi-Annual Enterprise (Preview)
    Version 2308 (Build 16731.20504)
  • Semi-Annual Enterprise
    Version 2308 (Build 16731.20504)
    Version 2302 (Build 16130.20884)
    Version 2208 (Build 15601.20848) 
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20624)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10406.20006)

Note: Depending on your installation type, this update can be installed via the Update Now button in Outlook itself or the Microsoft Store. This update does not apply to msi-based installations of Office 2016.


Exchange 2019 and 2016 Security Updates for November 2023

News

Security updates have been released for Exchange 2016 and Exchange 2019.

The updates fix the following vulnerabilities;

None of the vulnerabilities are currently publicly disclosed nor exploited. However, they are all rated as “Exploitation More Likely”, so make sure you update as soon as possible!

The updates also contain the following new feature and non-security issues;

View: Exchange Blog: Released: November 2023 Exchange Server Security Updates
View: Description of the security update for Microsoft Exchange Server 2019 and 2016: November 14, 2023 (KB5032146)
View: Description of the security update for Microsoft Exchange Server 2016: November 14, 2023 (KB5032147)

Download: Security Update V2 for Exchange 2019 CU12 and CU13
Download: Security Update V2 for Exchange 2016 CU23.


Outlook 2013 Update for November 2023

News

A Cumulative Update has been released for Outlook 2013. It resolves the following issue;

View: Download information for KB5002514

Note: This update can be installed via Microsoft Update or the Update Now button when you are using Office 2013 Click-To-Run and updates Outlook to version 15.0.5603.1000.


Partial word, string or wildcard search in Outlook

Search buttonOutlook’s indexed search is fast as long as you know the exact beginning of the word or string that you are looking for.

If you want to search for only a part of a word, like the middle or ending, you’ll have to use the much more cumbersome Advanced Find.

For instance, when searching for “write”, Outlook’s indexed search will only find messages containing “write” but Advanced Find will also find “rewrite”.

A similar situation exists when searching for product codes or reference numbers were people could leave out prefixes, spaces or dashes.

Or what about names?
Katerina or Caterina? Kristian or Christian?

With an Advanced Find macro we can make these type of searches quick and easy again.

Continue reading: Partial word, string or wildcard search in Outlook


Windows 11 (2023) and Outlook; An easy upgrade?

Windows 11 buttonThinking about upgrading your computer to Windows 11 or are you using Outlook on a Windows 11 computer already and are being offered the next major Windows 11 update?

There are a couple of things to be aware of when you heavily rely on Outlook.

The upgrade process from Windows 10 is actually quite streamlined and trouble free for most configurations; It is almost like applying a major update to Windows 10. Of course, things are even easier when you are already on Windows 11. However, there are still a couple of attention points to go through before you start and afterwards.

This guide contains not only upgrade preparation and troubleshooting steps but also various tips about the changes that you could encounter involving Outlook after upgrading to Windows 11.

Continue reading: Windows 11 (2023) and Outlook; An easy upgrade?


Reply and keep original attachments

Reply with Attachments buttonWhen you reply to an email in Outlook, the original emails are not included. This is because it is assumed that the original sender still has access to the original attachments.

There are however various valid scenarios in which it makes sense to keep the attachments. A common scenario which would benefit from this, is in longer mail threads where Reply All is used and where new people are being added.

Although there are various workarounds available, having this option integrated in Outlook is more efficient.

Continue reading: Reply and keep original attachments


Check sending account address before sending email

Select Sending Account buttonNowadays, it is quite likely that you have multiple email accounts configured in Outlook.

Especially when working from home, you don’t want to end up sending your business emails via your private account or vice versa.

Also, when you have access to a Shared Mailbox or are a delegate for the mailbox of a colleague, you could find yourself inadvertently send from these mailboxes or forget to select it when needed.

By adding this simple VBA macro to Outlook, you can prevent sending emails from the wrong email address.

Continue reading: Check sending account address before sending email


Add Teams, Skype, Zoom and other chat, call or meet now links to your signature

Chat & Meet in SignatureCommon signatures include a greeting, your name, your company name and possibly a website address and a phone number.

Since nowadays people contact each other a lot more via online meeting tools such as Teams, Skype and Zoom, you can also add special links which will allow the receiver to directly contact you via one of those methods as well.

With the use of recognizable icons, you can easily include these references without making your signature look huge.

This guide starts off with an example of a signature which is small but contains several instant communication links as well. After that, an overview is given of the instant communication links that can be used with commonly used IM and video conferencing clients.

Continue reading: Add Teams, Skype, Zoom and other chat, call or meet now links to your signature


Edit the HTML source code while composing a message in Outlook

Edit HTML Code buttonWhen composing a message in the HTML format in Outlook, the HTML code is automatically generated by the WordHTML engine. Unfortunately, Outlook does not provide a direct way of editing this generated HTML code.

With the EditHTML macro from this guide you can edit or completely replace the HTML of a message you are composing. This makes it much easier to make specific modifications or use the HTML code that you’ve created in another HTML editor.

This way you can make sure that your carefully created design, like for a newsletter, isn’t being modified again by WordHTML and remains compatible with other mail clients.

Continue reading: Edit the HTML source code while composing a message in Outlook


Schedule a recurring email with Outlook and PowerShell

Recurring Email buttonDo you need to send the same emails on a recurring basis like daily, weekly or monthly? Sending out reminders, forwarding reports or the latest offers and prices can be a tedious task.

Outlook doesn’t natively have this feature but with some PowerShell code or add-in, it can be done quite easily .

The PowerShell code in this guide allows you to send an email template, that you’ve created in Outlook. Optionally, it can look for a specific file to attach at the moment of sending to make sure you are always sending the latest version of the file. This guide contains step-by-step instructions to fully automate this process via the Windows Task Scheduler.

Scripts aren’t your thing? We’ve got you covered with some recommended 3rd party add-ins that can bring this functionality to Outlook as well.

Continue reading: Schedule a recurring email with Outlook and PowerShell


S/MIME support for Outlook on the Web (OWA) in Google Chrome or Microsoft Edge

S/MIME buttonS/MIME support for Outlook on the Web (OWA) used to be only available in Internet Explorer but it is now also possible to add this to Google Chrome and the new Microsoft Edge browser.

However, adding the required extension isn’t (currently) possible via the traditional means of using the Chrome Web Store or the Microsoft Edge Addons page.

This guide explains how you can manually install or deploy the Microsoft S/MIME Control for Outlook on the web.

Continue reading: S/MIME support for Outlook on the Web (OWA) in Google Chrome or Microsoft Edge


Executing PowerShell Scripts FAQ and Tips & Tricks

PowerShell Script buttonThere are several guides containing PowerShell scripts on HowTo-Outlook.com. PowerShell is a powerful scripting language which can be used by many applications including Outlook and Exchange. For end-user usage, it can be seen as the successor of vbs and batch scripts.

PowerShell scripts are easy to use but there are a couple of things to be aware of, especially when it is the first time you use such scripts.

This guide contains frequently asked questions regarding the use of PowerShell scripts and some additional tips and tricks to get you started.

Continue reading: Executing PowerShell Scripts FAQ and Tips & Tricks


Importing eml-files into Outlook

Import EML buttonIf you’ve ever used Outlook Express, Windows (Live) Mail, Thunderbird, Lotus/IBM Notes or basically any mail client other then Outlook, chances are that you have some eml-files stored somewhere as well.

While Outlook does support opening eml-files, it doesn’t offer a way to import them into Outlook.

This guides contains instructions and 2 scripts to import eml-files into an Outlook folder of your choice.

Continue reading: Importing eml-files into Outlook


Autodiscover: Some quick methods to get it working

Autodiscover.xml buttonThe Autodiscover service is a required service for Outlook-Exchange connectivity since Outlook 2007 and Exchange 2007 but for whatever reason, in some Exchange environments this still hasn’t been implemented correctly.

In some part, this was due to the fact that you could still get basic Outlook-Exchange connectivity by using some legacy Exchange 2003 RPC over HTTP dialog in Outlook. This (unsupported) method now no longer works in Outlook 2016, Outlook 2019 and Outlook for Office 365 due to the removal of this legacy dialog since Outlook doesn’t support Exchange 2003 anymore since Outlook 2013.

Unfortunately, this leaves up-to-date Outlook users disconnected when Autodiscover hasn’t been provisioned correctly by your company.

This guide contains some reasonably quick and easy and some less elegant methods for end-users but also for Exchange administrators to get your Outlook connected to Exchange again. All discussed solutions are fully supported configurations by Microsoft and do not require any changes to Exchange or the need for a new SSL Certificate.

Continue reading: Autodiscover: Some quick methods to get it working


Windows 10 (22H2 / October 2022 Update or earlier) and Outlook

Windows 10 buttonThinking about upgrading your computer to Windows 10 or are you using Outlook on a Windows 10 computer already and are being offered a major Windows 10 update?

What should you be aware of when you heavily rely on Outlook?

The upgrade process from Windows 7 and Windows 8 is actually quite streamlined and trouble free for most configurations. Things are even easier when applying a major update to Windows 10. However, for either upgrade, there are still a couple of attention points before you start.

This guide contains not only upgrade preparation and troubleshooting steps but also various tips about the changes that you could encounter involving Outlook after upgrading to Windows 10.

Continue reading: Windows 10 (22H2 / October 2022 Update or earlier) and Outlook


Outlook can’t connect to Gmail: Password incorrect

Gmail buttonWhen configuring your Gmail account in Outlook (or other mail clients such as Thunderbird and Mail apps on (older) smartphones), you may run into continuous password prompts or sync errors.

This is because Google has turned off Basic Authentication (which they refer to as Less Secure App Access) for all accounts since May 30, 2022. It now only lets you authenticate via the OAuth 2.0 standard.

As a result, you’ll get Send/Receive errors (0x800CCC0E) and could get prompted for your Gmail password again in Outlook and the login could fail even when you supply the correct password.

Continue reading: Outlook can’t connect to Gmail: Password incorrect


Outlook for Microsoft 365 Apps Feature Update for December 2023

News

A bit delayed because of the Christmas and New Year holidays, but Microsoft has now released the December 2023 feature update of Outlook for Microsoft 365 Apps in the Current Channel.

This time there is 1 new feature and 6 documented fixes for Outlook.

  • Office has a new default theme
    We’ve updated the default font and colors of the Office theme to be more modern and accessible.
  • We fixed an issue where the message list was blank when switching between the “Focused” and “Other” views.
  • We fixed an issue where Skype for Business was shutting down unexpectedly at start up.
  • We fixed an issue where the list of invalid recipients was showing duplicates.
  • We fixed an issue where Mail Tips were not showing for attachments.
  • We fixed an issue that caused Outlook to exit unexpectedly when opening embedded mail attachments in another application.
  • We fixed an issue that caused the tracking status summary to be missing from the organizer’s meeting form.

Note: Depending on your installation type, this update can be installed via the Update Now button in Outlook or the Microsoft Store and updates Outlook to: Version 2312 (Build 17126.20126).


Outlook 365 / 2021 / 2019 / 2016 Update for December 2023

News

The December security and rollup update has been made available for all Click-to-Run installations of Outlook 2016, Outlook 2019, Outlook 2021 and Outlook as part of a Microsoft 365 subscription.

It contains 2 security updates for Outlook (1) and Word (1). The details about the Outlook vulnerability can be found below;

  • CVE-2023-35636: Microsoft Outlook Information Disclosure Vulnerability
    • This vulnerability is currently not publicly disclosed nor exploited.
    • Exploitation of the vulnerability requires that a user open a specially crafted file.
    • The Preview Pane is not an attack vector.
    • The Exploitability Assessment is rated: Exploitation Less Likely.

In addition, it contains 1 non-security fix related to Outlook Current Channel Version 2311, 1 new feature and 13 fixes related to Outlook Monthly Enterprise Version 2310, 5 fixes related to Outlook Semi-Annual (Preview) Version 2308, and 1 fix related to Outlook Semi-Annual Version 2302. Most notable fixes are;

  • Version 2311
    • We fixed an issue where the message list was blank when switching between the “Focused” and “Other”. views.
  • Version 2310
    • Teams Meeting Apps now work in Outlook too
      Now, you can configure a meeting app while scheduling an invite in Outlook. This meeting app will be ready to use when you chat or join the meeting on Teams.
    • We fixed an issue that caused a meeting update to be sent to all attendees when clicking on “cancel” in the “Send Update to Attendees” dialog.
    • We fixed an issue that caused Outlook to fail to comply with the default browser settings for some users.
    • We fixed an issue where Microsoft account users were missing their Outlook Add-ins.
    • We fixed an issue where new lines were added to an Outlook signature when pressing Enter in the body of the email.
  • Version 2308
    • We fixed an issue that caused delegates to be unable to view their manager’s private calendar items even when granted permission.
    • We fixed an issue where setting Breaks to Continuous changed to Page after a Mail Merge.
  • Version 2302
    • We fixed an issue that caused SafeLinks to fail to launch properly when the target document was in a nested folder.

Based on your release channel, you’ll be updated to the following version;

  • Microsoft 365 Apps, Outlook 2016 Retail, Outlook 2019 Retail, Outlook 2021 Retail
    Version 2311 (Build 17029.20108)
  • Monthly Enterprise
    Version 2310 (Build 16924.20180)
    Version 2309 (Build 16827.20324)
  • Semi-Annual Enterprise (Preview)
    Version 2308 (Build 16731.20460)
  • Semi-Annual Enterprise
    Version 2302 (Build 16130.20868)
    Version 2208 (Build 15601.20832) 
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20615)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10405.20015)

Note: Depending on your installation type, this update can be installed via the Update Now button in Outlook itself or the Microsoft Store. This update does not apply to msi-based installations of Office 2016.


Outlook 2016 (MSI) Security Update for December 2023

News

A Security Update has been released for Outlook 2016. It resolves the following vulnerability;

  • CVE-2023-35636: Microsoft Outlook Information Disclosure Vulnerability
    • This vulnerability is currently not publicly disclosed nor exploited.
    • Exploitation of the vulnerability requires that a user open a specially crafted file.
    • The Preview Pane is not an attack vector.
    • The Exploitability Assessment is rated: Exploitation Less Likely.

View: Download information for KB5002529

Note: This update can be installed via Microsoft Update and updates Outlook to version 16.0.4978.1000. This update does not apply to Perpetual (Retail) and Microsoft 365 based installations of Office 2016.


Outlook for Microsoft 365 Apps Feature Update for November 2023

News

Microsoft has released the November 2023 feature update of Outlook for Microsoft 365 Apps in the Current Channel.

This time there are 5 documented fixes for Outlook and 2 related to Outlook.

  • We fixed an issue where Outlook would close unexpectedly when a user clicked “Cancel” in the Wait on Send dialog if the message had attachments.
  • We fixed an issue where Mail Tips were not showing for attachments.
  • We fixed an issue where the list of invalid recipients was showing duplicates.
  • We fixed an issue that caused Outlook to exit unexpectedly when opening embedded mail attachments in another application.
  • We fixed an issue where the scrollbar didn’t render in the Contact Card View.
  • We fixed an issue where attendees were not added automatically from the Meeting Details when using the Email Page functionality. (OneNote)
  • We fixed an issue where setting Breaks to Continuous changed to Page after a Mail Merge. (Word)

Note: Depending on your installation type, this update can be installed via the Update Now button in Outlook or the Microsoft Store and updates Outlook to: Version 2311 (Build 17029.20068).


Outlook 365 / 2021 / 2019 / 2016 Update for November 2023

News

The November security and rollup update has been made available for all Click-to-Run installations of Outlook 2016, Outlook 2019, Outlook 2021 and Outlook as part of a Microsoft 365 subscription.

It contains 4 security updates for Excel (2) and Office (2).

In addition, it contains 4 non-security fixes related to Outlook Current Channel Version 2310, 1 new feature and 5 fixes related to Outlook Monthly Enterprise Version 2309, 4 fixes related to Outlook Monthly Enterprise Version 2308, 4 fixes related to Outlook Semi-Annual (Preview) Version 2308, 1 fix related to Outlook Semi-Annual Version 2302, and 1 fix related to Outlook Semi-Annual Version 2208.

  • Version 2310
    • We fixed an issue that caused Outlook to fail to comply with the default browser settings for some users.
    • We fixed an issue that caused the labels from protected PDF files to not be applied to the email that they were attached to.
    • We fixed an issue where new lines were added to an Outlook signature when pressing Enter in the body of the email.
    • We fixed an issue that caused Outlook to exit unexpectedly when clicking the “More” link in the Search results list.
  • Version 2309
    • Updated encryption for Microsoft Purview Information Protection
      Advanced Encryption Standard (AES) with 256-bit key length in Cipher Block Chaining mode (AES256-CBC) is now the default Microsoft Purview Information Protection encryption mechanism for Microsoft 365 Apps documents and emails.
    • We fixed an issue that caused a meeting update to be sent to all attendees when clicking on “cancel” in the “Send Update to Attendees” dialog.
    • We fixed an issue that caused Outlook to exit unexpectedly after clicking “Cancel” on the Wait on Send dialog.
    • We fixed an issue that caused Outlook to exit unexpectedly when searching a shared or delegated mailbox.
    • We fixed an issue where the setting to control how Outlook opens previous items at start-up was missing from the Options window.
    • We fixed an issue where Microsoft account users were missing their Outlook Add-ins.
  • Version 2308
    • We fixed an issue that caused a meeting update to be sent to all attendees when clicking on “cancel” in the “Send Update to Attendees” dialog.
    • We fixed an issue that caused sensitivity labels to display incorrectly when they contain non-ASCII characters.
    • We fixed an issue that caused Outlook to exit unexpectedly after clicking “Cancel” on the Wait on Send dialog when attachments are present.
    • We fixed an issue that caused the labels from protected PDF files to fail to be applied to the email that they were attached to.
  • Version 2302
    • We fixed an issue that caused Outlook to exit unexpectedly after clicking “Cancel” on the Wait on Send dialog when attachments are present.
  • Version 2208
    • We fixed an issue that caused the body of meeting requests to sometimes be truncated or blank after applying the August 2023 security update.

Based on your release channel, you’ll be updated to the following version;

  • Microsoft 365 Apps, Outlook 2016 Retail, Outlook 2019 Retail, Outlook 2021 Retail
    Version 2310 (Build 16924.20150)
  • Monthly Enterprise
    Version 2309 (Build 16827.20278)
    Version 2308 (Build 16731.20398)
  • Semi-Annual Enterprise (Preview)
    Version 2308 (Build 16731.20398)
  • Semi-Annual Enterprise
    Version 2302 (Build 16130.20846)
    Version 2208 (Build 15601.20816) 
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20604)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10404.20013)

Note: Depending on your installation type, this update can be installed via the Update Now button in Outlook itself or the Microsoft Store. This update does not apply to msi-based installations of Office 2016.