Last Updated: April 25, 2023
After updating to Outlook Version 2303 (Build 16227.20212) Users may be unable to view or access Microsoft 365 group calendars and email messages in Outlook Desktop.
Affected users are part of a Microsoft 365 group. Some affected users may also notice that impact self-resolves after some time, although impact may also reoccur at a later time. These users may also be unable to perform one or more of the following actions in the Outlook desktop client:
Add or access the group mailbox
Add or access the group calendar
Add, remove, or edit group members
Change mail items, such as marking as read, archive, or moving email to other folders
This issue is fixed in Outlook Desktop Version 2304 Build 16327.20214. You can install the update by clicking File > Office Account > Update Options > Update Now. Tenant Admins can also refer to the Service Health Dashboard for updates for incident EX540503.
Note: If you reverted and disabled updates, please remember to re-enable updates now that the fix is available.
To temporarily workaround the issue use one of the following:
Use Outlook Web Access (OWA) to use the Groups feature
Revert to the Outlook Desktop build prior to the issue occurring, build 16130.20332. You can use ODT steps, How to revert to an earlier version of Office or by following the steps below.
To revert to the prior build, do the following:
Open a Command Prompt (Run as Administrator).
Type/paste the following commands and press Enter after each:
cd %programfiles%\Common Files\Microsoft Shared\ClickToRun
officec2rclient.exe /update user updatetoversion=16.0.16130.20332
In the backstage, disable Updates (File, Office Account, Update Options, Disable Updates).
Set a reminder on your calendar for May 9, 2023, to remember to re-enable updates. The fix should be out sooner, but May 9 is Patch Tuesday, and the fix will be in this update.
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