Outlook 2016 / 2019 / 365 Update for June 2021

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

It contains 5 security updates for Access (1), Excel (1), Outlook (1), and Office (2).

The details about the Outlook vulnerability;

  • CVE-2021-31949: Microsoft Outlook Remote Code Execution Vulnerability.
    • This vulnerability is currently not publicly disclosed nor exploited.
    • The Preview Pane is not an attack vector.
    • The Exploitability Assessment is rated: Exploitation Less Likely.

In addition, it contains 2 documented non-security fixes for Outlook Current Version 2103, 11 fixes for Monthly Enterprise Version 2104, and 6 fixes for Semi-Annual (Preview) Version 2102. Most notable fixes are;

  • Version 2105
    We fixed an issue that may cause Outlook to close unexpectedly when interacting with Mail or Calendar Views.
  • Version 2105
    We fixed an issue that caused users to experience an unexpected close when removing folders from an archive store.
  • Version 2104
    We fixed an issue that caused some users of the calendar sharing improvements feature to experience issues with interacting with their calendar in the navigation pane.
  • Version 2104
    We fixed an issue that could cause users to see the message that they are composing losing the UI focus.
  • Version 2104 and 2102
    We added a registry key that disables the new Room Finder experience (the same experience as in Outlook for Web) and enables the legacy Room Finder with Suggested Times.
    • Key: HKCU\SOFTWARE\Microsoft\Office\16.0\Outlook\Options\Calendar
    • Value name: ShowLegacyRoomFinder
    • Value type: REG_DWORD
    • Value
      • 0 (Default)
        New Room Finder UI
      • 1
        Legacy Room Finder UI
  • Version 2102
    Fixed an issue where end users and administrators were unable to turn on Cloud Settings.

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

  • Microsoft 365 Apps, Outlook 2016 Retail, Outlook 2019 Retail
    Version 2105 (Build 14026.20270)
  • Monthly Enterprise
    Version 2104 (Build 13929.20408)
    Version 2103 (Build 13901.20554)
  • Semi-Annual Enterprise (Preview)
    Version 2102 (Build 13801.20738)
  • Semi-Annual Enterprise
    Version 2008 (Build 13127.21668)
    Version 2002 (Build 12527.21952) 
  • Outlook 2019 Volume License
    Version 1808 (Build 10375.20036)

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.