Unable to dismiss shared calendar reminders for Outlook.com accounts in Outlook Desktop

Last Updated: February 15, 2023

ISSUE

When you dismiss an Outlook.com calendar reminder for a shared calendar in Outlook Desktop the reminder is not dismissed and reappears.

In addition, the following symptoms are also observed with this issue on shared calendars:

• You cannot create or edit appointments or events on the shared calendars.

• You cannot access the calendar’s permissions dialog box (right click the shared calendar, Properties, Permissions, causes error: “Some permissions cannot be displayed”)
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STATUS: FIXED

This issue is fixed in service version 15.20.6086.24.  To check the service version to determine if the fix is available, use the Outlook Connection Status dialog described in this article: Description of the Connection Status dialog in Outlook.
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After you have confirmed the fix, use the steps below to re-enable Shared Calendar Improvements.  For the best experience with shared calendars you will need Shared Calendar Improvements enabled. 

To undo the workaround for the issue, reenable Shared Calendar Improvements using the following steps: 

1. In Outlook, select File >Account Settings >Account Settings.  You will see a list of your email accounts.

2. Select the Outlook.com account that you use to manage someone else's calendar and choose Change....

3. Choose More Settings, followed by the Advanced tab.

4. Check the checkbox next to Turn on shared calendar improvements.
   
   

5. Select Apply and OK.