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

The April 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 Excel.

In addition, it contains 15 non-security fixes related to Outlook Monthly Enterprise Version 2402, 3 fixes related to Outlook Semi-Annual (Preview) Version 2402, and 1 fix related to Outlook Semi-Annual Version 2308 and 2302. Most notable fixes are;

  • Version 2402, 2308 and 2303
    • We fixed an issue that caused the following symptoms:
      • Users were unable to recall a message in some environments.
      • Users were unable to address synchronization conflicts
      • Users were unable to load forms from third party MAPI forms servers.
  • Version 2402
    • We fixed an issue that caused Outlook to exit unexpectedly after attaching an Outlook item from the Insert tab.
    • We fixed an issue that caused some users to see Outlook exiting unexpectedly when clicking a hyperlink.
    • We fixed an issue with mail view appearing blank for an extended time when switching folders.
    • We fixed an issue that caused Outlook to exit unexpectedly when expanding a conversation in the search results from a search of “All Mailboxes.”
    • We fixed an issue where users were unable to send emails from QuickBooks, as described in the following article: Unable to send emails from QuickBooks using Outlook Desktop after update to Version 2402.

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 2403 (Build 17425.20176)
  • Monthly Enterprise
    Version 2402 (Build 17328.20282)
    Version 2401 (Build 17231.20304)
  • Semi-Annual Enterprise (Preview)
    Version 2402 (Build 17328.20282)
  • Semi-Annual Enterprise
    Version 2308 (Build 16731.20636)
    Version 2302 (Build 16130.20960) 
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20685)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10409.20028)

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.