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AlyssaL036's avatar
AlyssaL036
Brass Contributor
Dec 28, 2021
Solved

Outlook Calendar Groups Malfunctioning

Hello!   I’ve been having an issue with Outlook’s calendar groups since November 5th of this year. I believe the issue started almost immediately after Outlook went through a larger update (the one...
  • AlyssaL036's avatar
    AlyssaL036
    Nov 28, 2022

    I'll save anyone reading this thread some time - these are the two solutions that have worked for people:

    For me, it worked to repair my Outlook installation:

    It seems people have misunderstood my original solution. I did not "re-install" Outlook, I "repaired my installation" of Outlook. Those are two different things. I haven't had the issue since then. See this link to learn how to repair the installation: https://www.slipstick.com/tutorial/repair-office-outlook-installation/#:~:text=The%20steps%20are%20basically%20the%20same%20for%20all,the%20desired%20repair%20option%20and%20complete%20the%20wizard

    For others, it worked to uncheck "Turn on shared calendar improvements".

    1. File
    2. Account Settings
    3. Account Settings (Again)
    4. Email Tab
    5. Double Click Your Email In The List
    6. More Settings
    7. Advanced
    8. Uncheck "Turn on shared calendar improvements" Under "Microsoft 365 Features"
    9. Click Apply
    10. Click OK
    11. Exit Outlook Entirely
    12. Restart Outlook

    If it doesn't work after these steps, restart your computer and then check again before assuming this step hasn't worked. If another solution is found, I will edit this comment with that solution.

d_kennedy's avatar
d_kennedy
Copper Contributor
Nov 28, 2022

Our experience is the same as MartinHolstDk. Uninstalling/reinstalling Office/Microsoft 365 doesn't resolve the issue. Enabling/disabling shared calendar improvements also offers no resolution.

MartinHolstDk, thanks for sharing the Outlook.exe/ResetSharedFolders "solution." Until Microsoft changes the functionality in OWA to allow an individual calendar to be added to multiple calendar groups, I suspect I'm going to have to document a work around solution for our admin assistants that will still require cleaning up calendar groups. If you get a resolution from Microsoft, please let us know. Thanks!

AlyssaL036's avatar
AlyssaL036
Brass Contributor
Nov 28, 2022

I'll save anyone reading this thread some time - these are the two solutions that have worked for people:

For me, it worked to repair my Outlook installation:

It seems people have misunderstood my original solution. I did not "re-install" Outlook, I "repaired my installation" of Outlook. Those are two different things. I haven't had the issue since then. See this link to learn how to repair the installation: https://www.slipstick.com/tutorial/repair-office-outlook-installation/#:~:text=The%20steps%20are%20basically%20the%20same%20for%20all,the%20desired%20repair%20option%20and%20complete%20the%20wizard

For others, it worked to uncheck "Turn on shared calendar improvements".

  1. File
  2. Account Settings
  3. Account Settings (Again)
  4. Email Tab
  5. Double Click Your Email In The List
  6. More Settings
  7. Advanced
  8. Uncheck "Turn on shared calendar improvements" Under "Microsoft 365 Features"
  9. Click Apply
  10. Click OK
  11. Exit Outlook Entirely
  12. Restart Outlook

If it doesn't work after these steps, restart your computer and then check again before assuming this step hasn't worked. If another solution is found, I will edit this comment with that solution.

  • d_kennedy's avatar
    d_kennedy
    Copper Contributor
    Jan 13, 2023

    I revisited this issue this week and have some experience updates.

    Using OWA, I still cannot add an individual's calendar to more than one calendar group. Microsoft really needs to address this. The options for doing so have changed since I last tried in Oct/Nov 2022 and hopefully give you the impression that this can be done, only to fail at the end of the process.

    What has also changed (and I can't tell you why) is that UNCHECKING the Turn on shared calendar improvements box has improved the functionality of calendar groups in the Outlook 365 app, confirming one of AlyssaL036's suggested resolutions. Previously, if an individual's calendar appeared in multiple calendar groups, the O365 app user would see that individual's calendar duplicated numerous times in those calendar groups. Yesterday I unchecked the turn on shared calendar improvements box, exited and restarted Outlook and saw the calendar group listings shuffle into the correct order. This resolved the issue for me and one other person. I'm testing further next week with another individual.

    Using the calendar group feature shouldn't have to be this hard and unpredictable.

    • Kulli2005's avatar
      Kulli2005
      Copper Contributor
      Apr 05, 2023

      did you manage to resolve the issue? d_kennedy 

      • MartinHolstDk's avatar
        MartinHolstDk
        Copper Contributor
        Apr 11, 2023

        Just a quick update from us.

        Disabling "Calendar Improvements" (REST API) did not solve our problems.
        Neither did any other "fixes" on affected users' PC's.
        The issues follows the affected user on every PC they log on to.
        We have even logged on from non-corporate PC/Windows/Outlook without luck.

        The only fix for us is to reset "favorite folders" on the mailbox end (by running "Outlook.exe /ResetSharedFolders) and wait for the "reset" to sync to the mailbox in Exchange Online.

        Our Microsoft case "stranded" with MS claiming that "it must be a problem on the local PC"

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