Outlook for Microsoft 365 Apps Feature Update for November 2024

News

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

There are 8 fixes related to Outlook but there is also a new feature which applies to the Office Suite in general.

  • Protect sensitive files with dynamic watermarking
    Deter leakage of your highly confidential document content by rendering the reader’s email address and other information over the document. This is configurable on sensitivity labels.
  • We fixed an issue that caused the Wait on Send experience to stop working until the user clicked “Send Anyway.”
  • We fixed an issue that caused users who were replying to a message with an Information Rights Management policy applied to see the error “You don’t have permission to make this change to the sensitivity label” when no label changes were made.
  • We fixed an issue where users using parentheses in the name of their signatures weren’t seeing the signatures in the Insert>Signatures list.
  • We fixed an issue where Outlook would stop responding when a user tried to create an Outlook profile for a different user when OneAuth was enabled.
  • Fixed an issue that was preventing emails with linked SVG content from saving or sending. (Word)
  • Resolved an issue in Outlook where unexpected characters may appear in comments when using the setting “preface comments with” and the Aptos font. (Word)
  • Resolved an issue in Outlook where text may be truncated on the right side of the message when using an HTML email template. (Word)
  • Resolved an issue where Word would give the error “Word could not re-establish a DDE connection to Microsoft Query to complete the current task” when selecting MS Query as the data source for “Mail Merge Create Data Source”. (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 2411 (Build 18227.20152).


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

News

The November security and rollup update has been made available for all Click-to-Run installations of Outlook 2016, Outlook 2019, Outlook 2021, Outlook 2024, and Outlook as part of a Microsoft 365 subscription.

It contains 8 security updates for Excel (5), Word (1), and Shared Office Components (2).

In addition, it contains 1 non-security fix related to Outlook Current Channel Version 2410, 5 fixes related to Outlook Monthly Enterprise Version 2409, and 2 fixes related to Semi Annual Preview Version 2408.

  • Version 2410
    • Resolved an issue where all characters didn’t appear correctly when creating an Outlook task from OneNote.
  • Version 2409
    • We fixed an issue where the app closed unexpectedly when a cache file contained corrupted data.
    • Resolved an issue where an email wouldn’t fully render in the preview pane. (Word)
    • Fixed an issue that was preventing emails with linked SVG content from saving or sending. (Word)
  • Version 2409 and 2408
    • We fixed an issue that caused content marking to not show up properly in S/MIME messages.
    • We fixed an issue where Wait On Send evaluation would never complete if the editor was processing changes.

Current versions and build numbers

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, Outlook 2024 Retail
    Version 2410 (Build 18129.20158)
  • Monthly Enterprise
    Version 2409 (Build 18025.20214)
    Version 2408 (Build 17928.20286)
  • Semi-Annual Enterprise (Preview)
    Version 2408 (Build 17928.20286)
  • Semi-Annual Enterprise
    Version 2402 (Build 17328.20648)
    Version 2308 (Build 16731.20948) 
  • Outlook LTSC 2024
    Version 2408 (Build 17932.20162)
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20812)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10416.20007)

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 2024

News

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

The updates fix the following vulnerability and implements a security advisory;

  • CVE-2024-49040: Microsoft Exchange Server Elevation of Privilege Vulnerability

The vulnerability currently is publicly disclosed but not yet exploited. As it is rated “Exploitation More Likely”, it is highly recommended to update as soon as possible.

The update also comes with the following new features;

In addition, there are 9 non-security fixes included in this update.

View: Exchange Blog: Released: November 2024 Exchange Server Security Updates
View: Description of the security update for Microsoft Exchange Server 2019 and 2016: November 12, 2024 (KB5044062)

Exchange 2019 CU14 SU3 – Download
Exchange 2019 CU13 SU7 – Download
Exchange 2016 CU23 SU14 – Download


Outlook 2016 (MSI) Security Update for August 2024

News

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

  • CVE-2024-38173: Microsoft Outlook Remote Code Execution Vulnerability
    • This vulnerability is currently not publicly disclosed nor exploited.
    • An attacker must gain access to the victim user’s Microsoft Outlook account by compromising or stealing their login credential and then install a malicious form prior to exploiting the vulnerability successfully.
    • Successful exploitation of this vulnerability requires a user to open a malicious email with an affected version of Microsoft Outlook and then perform specific actions to trigger the vulnerability.
    • The Preview Pane is an attack vector.
    • The Exploitability Assessment is rated: Exploitation Less Likely.

View: Download information for KB5002626

Note: This update can be installed via Microsoft Update and updates Outlook to version 16.0.5461.1001. This update does not apply to Perpetual (Retail) and Microsoft 365 based installations of Office 2016.


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 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 October 2024

News

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

There are again no new features but there are 10 fixes related to Outlook.

  • We fixed an issue where the accessibility mail tip kept appearing and disappearing, causing the content to jump when composing an email.
  • We fixed an issue where Do Not Forward (DNF) was left on message when applying and removing label.
  • We fixed an issue that caused users with a large number of folders expanded during synchronization to experience a non-delivery receipts (NDRs) with the failure MAPI_E__TOO_BIG (0x80040305).”
  • We fixed an issue where a meeting request received by an Exchange account would appear with a blank body in Outlook Desktop cached mode.
  • We fixed an issue where adding an Outlook or a Hotmail account to a mail profile nullified a policy preventing copying messages between exchange stores.
  • We fixed an issue in Outlook where mail from a profile activated and directed to a different portal was being redirected to https://portal.microsoft.com.
  • We resolved an offline address book (OAB) download issue by adding a registry key to give the BITS jobs for automatic (non-manual) OAB downloads the same priority as the BITS jobs for manual (user-initiated) OAB downloads.
  • We fixed an issue where opening an .ICS attachment from a email shows security prompt.
  • We fixed an issue where content marking wasn’t working for HTML messages when SMIME was enabled.
  • Resolved an issue in Outlook where content may not be visible in the email body unless using Forward or Reply.

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 2410 (Build 18129.20116).


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

News

The September security and rollup update has been made available for all Click-to-Run installations of Outlook 2016, Outlook 2019, Outlook 2021, Outlook 2024, and Outlook as part of a Microsoft 365 subscription.

It contains 5 security updates for Excel (1), Visio (1), and Shared Office Components (3).

In addition, it contains 2 non-security fixes related to Outlook Current Channel Version 2409, and 4 fixes related to both Outlook Monthly Enterprise Version 2408 as well as Semi Annual Preview Version 2408.

  • Version 2409
    • We fixed an issue that caused users in hybrid environments to be unable to apply labels to emails.
  • Version 2408
    • We fixed an issue that caused the buttons on the Reminders dialog to be truncated with some fonts.
    • We fixed an issue that caused default SMIME labels to fail to apply when a user replies to or forwards an unlabeled message.
    • We fixed an issue that caused users in hybrid environments to be unable to apply labels to emails.
    • We fixed an issue that made it possible for a legacy WebView ItemSend add-in to bypass condition checks when switching items.

Current versions and build numbers

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, Outlook 2024 Retail
    Version 2409 (Build 18025.20140)
  • Monthly Enterprise
    Version 2408 (Build 17928.20216)
    Version 2407 (Build 17830.20232)
  • Semi-Annual Enterprise (Preview)
    Version 2408 (Build 17928.20216)
  • Semi-Annual Enterprise
    Version 2402 (Build 17328.20612)
    Version 2308 (Build 16731.20810) 
  • Outlook LTSC 2024
    Version 2408 (Build 17932.20130)
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20791)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10415.20025)

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 for Microsoft 365 Apps Feature Update for September 2024

News

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

There are only 3 fixes related to Outlook but there is also a new feature which applies to Word, Excel, and PowerPoint.

  • Modernized user-defined permissions experience
    We’ve improved the user experience for selecting which users should have which permissions when a sensitivity label configured for user-defined permissions is applied to a file or when configuring standalone Information Rights Management through the Restrict Access feature.
  • We fixed an issue that made it possible for a legacy WebView ItemSend add-in to bypass condition checks when switching items.
  • We fixed an issue where the app closed unexpectedly when a cache file contained corrupted data.
  • Resolved an issue where an email wouldn’t fully render in the preview pane. (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 2409 (Build 18025.20096).


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

News

The September 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 (1), Visio (2), and Publisher (1).

In addition, it contains 7 non-security fixes related to Outlook Monthly Channel Version 2407.

  • We fixed an issue that caused users to be unable to send mails while the dlpwaitonsendtimeout registry key was set. (applies to Data Loss Prevention)
  • We fixed an issue that caused the buttons on the Reminders dialog to be truncated with some fonts.
  • We resolved an issue by implementing an admin-controlled policy for MailTips. This policy ensures that users receive notifications when their emails are blocked, restricted, or contain sensitive information.
  • We fixed an issue that caused Copilot drafts to display incorrectly with non-Latin character sets.
  • We fixed an issue that caused users to be unable to see the categories they applied to an email until after they closed the email window.
  • Resolved an issue where characters could appear corrupted when opening RTF emails. (Word)
  • We fixed a problem specific to Rich Text Format emails, where images inserted into the email would become degraded when the email was saved as a draft. (Office)

New! Semi-Annual Enterprise (Preview) Version 2408

Version 2408 has now also been released to the Semi-Annual Enterprise Channel (Preview). Although it doesn’t contain any new features for Outlook, there is one for Word that is Outlook related. It also contains over 40 fixes related to Outlook. Some highlights are;

  • Assign Tasks (Word)
    You can facilitate collaboration and stay organized by creating and assigning tasks directly from within your Word document using @mentions in comments. The people you assign the tasks to will receive email notifications, letting them know they need to take action. Ready to give it a try? Open an existing document stored on OneDrive or SharePoint. Highlight the text that contains the information you want to comment on, select New Comment, write your comment and type @ followed by the name of the team member you want to tag. Then, press Ctrl + Enter to post your comment and select the Assign to check box to convert your comment into a task.
  • We added support for converting some COM add-ins to Web add-ins.
  • We fixed an issue that caused users to see no prompt to send updates to attendees after removing attendees from a meeting on a shared calendar where the location of the meeting was set.

Current versions and build numbers

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 2408 (Build 17928.20156)
  • Monthly Enterprise
    Version 2407 (Build 17830.20210)
    Version 2406 (Build 17726.20222)
  • Semi-Annual Enterprise (Preview)
    Version 2408 (Build 17928.20156)
  • Semi-Annual Enterprise
    Version 2402 (Build 17328.20588)
    Version 2308 (Build 16731.20810) 
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20771)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10414.20002)

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 for Microsoft 365 Apps Feature Update for August 2024

News

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

There are 2 new features which apply to all major Office applications and 3 fixes for Outlook.

  • Use sensitivity labels in Microsoft 365 apps when connected experiences are disabled
    Your organization can now disable connected experiences for privacy concerns without impacting data security policies, such as sensitivity labels. Services associated with Microsoft Purview (e.g. sensitivity labels, rights management, …) are no longer controlled by policy settings to manage privacy controls for Microsoft 365 Apps. Instead, these services will rely on their existing security admin controls in Purview portals.
  • Open locked records as read-only
    Files with retention labels marking them as locked records will now open as read-only to prevent user edits.
  • We fixed an issue that caused default SMIME labels to fail to apply when a user replies to or forwards an unlabeled message.
  • We fixed an issue that caused the buttons on the Reminders dialog to be truncated with some fonts.
  • We fixed an issue that caused users to be unable to send mails while the dlpwaitonsendtimeout registry key was set. (applies to Data Loss Prevention)

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 2408 (Build 17928.20114).


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

News

The August 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 7 security updates for Excel (2), Outlook (1), PowerPoint (1), Project (1), Visio (1), and Shared Office Components (1). The details about the Outlook vulnerability can be found below;

  • CVE-2024-38173: Microsoft Outlook Remote Code Execution Vulnerability
    • This vulnerability is currently not publicly disclosed nor exploited.
    • An attacker must gain access to the victim user’s Microsoft Outlook account by compromising or stealing their login credential and then install a malicious form prior to exploiting the vulnerability successfully.
    • Successful exploitation of this vulnerability requires a user to open a malicious email with an affected version of Microsoft Outlook and then perform specific actions to trigger the vulnerability.
    • The Preview Pane is an attack vector.
    • The Exploitability Assessment is rated: Exploitation Less Likely.

In addition, it contains 10 non-security fixes related to Outlook Monthly Channel Version 2406.

  • We resolved an issue where characters don’t appear correctly in Text Box Gallery.
  • We fixed an issue that caused Outlook to exit unexpectedly when using Copilot Summarize.
  • We fixed an issue that caused users to see Outlook exit unexpectedly when declining a meeting and sending a response.
  • We fixed an issue where a MailTip would disappear and render an attachment not detectable after an email with an attachment containing sensitive information was forwarded.
  • We fixed an issue that caused Copilot drafts to display incorrectly with non-Latin character sets.
  • We fixed an issue that caused users to be unable to see the categories they applied to an email until after they closed the email window.
  • We fixed an issue that caused Outlook to exit unexpectedly shortly after launch for some users.
  • We fixed an issue that prevented users from sending mail for a few hours after add-ins with on-send events were updated.
  • Resolved an issue in Word where pasting data from Word or Excel to an Outlook template as a link would give an error message. (Word)
  • Resolved an issue when assigning a Task in Outlook, characters may not render correctly. (Word)

  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 2406 (Build 17830.20166)
  • Monthly Enterprise
    Version 2406 (Build 17726.20206)
    Version 2405 (Build 17628.20206)
  • Semi-Annual Enterprise (Preview)
    Version 2402 (Build 17328.20550)
  • Semi-Annual Enterprise
    Version 2402 (Build 17328.20550)
    Version 2308 (Build 16731.20792)
    Version 2302 (Build 16130.21094) 
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20763)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10413.20020)

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.