I have now at one client (Outlook 2021) the same problem. In the status bar from outlook there is always updating calendar, but it will not - so the new calendar entries are not being synced - next time starting outlook they are gone.

In the mapi log there is an entry:

But i do not know if this is the problem.

Any ideas?

Thanks

Rudolf

Hello gentlemen! This usually means you have an appointment in there that is causing you sync trouble. Have either of you tried going through this process here to see if it is resolved under a new profile?

If these issues persist after doing so I recommend submitting a ticket so we can assist you in getting to the bottom of this.

Thanks Kyle,

That did resolve the issue.

You're very welcome Larry! If you see that come back it may still hint at some problematic content in the account that eventually introduces sync issues, so in that case please submit a ticket and we'd be happy to help find it. 

Hello Kyle, i made all the steps you said (https://portal.smartertools.com/kb/a3487/how-to-thoroughly-replace-your-mapi-account.aspx). After a few days the problem is here again. Outlook says "updating calendar" and nothing else works as it hangs at this step.

In the logfile i found the following:

[2024.05.24] 08:52:21.323 [{9977E3AD-3D50-4DEB-87BD-9831EA79445E}:21] [xxx@xxx.xx] Calendar Property Error: [0x9210] PidLidAppointmentRecur(Binary): 118 bytes
[2024.05.24] 08:52:21.341 [{9977E3AD-3D50-4DEB-87BD-9831EA79445E}:35] [xxx@xxx.xx] System.NullReferenceException: Object reference not set to an instance of an object.
[2024.05.24]  LogonId:0 ResponseHandleIndex:0 InputHandleIndex:0 SaveFlags:8 payloadServerObjectHandleTable:1Caller: [xxx@xxx.xx] Owner: [xxx@xxx.xx]

I think thats the point where the syncing hangs.

Any ideas?

Thanks!

Rudolf