Mac Calendar not syncing with Exchange on Ventura

Don't know anything about Exchange or how it fits in here, but I resolved the Calendar not syncing in Ventura issue.

Utilize a Time Machine backup of any machine with a working Calendar.  Do a restore with the Time Machine backup.  If the Time Machine backup is from your machine (maybe a laptop, different machine, old backup, etc.) or any other machine with the same Apple ID and a matching user profile replace the user profile with the one from the Time Machine backup when offered the opportunity.  

This will give you your user profile and a working Calendar as best as I can tell.

Call me if you have questions.

I am pretty sure this is an Exchange issue in the AWS (?) module. Microsoft has multiple interfaces to Exchange. Microsoft products use the Activesync interface, which is also used by iOS products as Apple was able to obtain a license for iOS. Macs use the other interface which is not well supported by Microsoft and has a number of known bugs that Microsoft is not interested in fixing. Not sure why Apple does not use Activesync for macOS, but it may be that Microsoft will not license that interface for macOS because it is a competitor to Windows.

Your Exchange Server admin can temporarily clear this up, but it will reoccur until Microsoft fixes the bugs.

My Ventura installation has generally been working fine since I completely rebuilt my Exchange account. But I'm still having issues with Zoom invites not being recognized as calendar invites that I can accept in Mail.app even after updating to 13.1.

Hi, the problem is coming from the protocol used by Apple to connect to Exchange services. On iPhone and iPad, Apple is using the ActiveSync protocol and it works well. But on MacOS, for a strange reason which is not understandable, Apple is using the EWS protocol from Microsoft. EWS is a very old one and is not correctly supported both by Apple (in Ventura) and by Microsoft as well... Why Apple doesn't use Active Sync on MacOS ?

Have been working through this for the last month. First solution was to delete and re-add the accounts as soon as the error was found. Just found it again, and before going through process above, restarted the Mac and calendar events are showing up in Outlook, iphone calendar, and Mac calendar as they should.

For now, restart seems to be the simplest workaround until a permanent fix/patch is released

Having this same issue after the Ventura update. I have 3 separate Exchange accounts configured on my Mac. 2 of them are low volume departmental accounts, and the 3rd is my own individual account. The departmental ones are operating just fine, but my individual account is not working right. No updates show up in Calendar. Most* calendar invitations/cancellations are showing fine in Mail, and if I click accept/reject on an invitation or OK on a cancellation, my actual calendar is updated as viewed in Outlook or the Exchange web interface, but no updates are shows in the Mac Calendar app at all. I turned off Calendar capabilities for that account in System Setting, which resulted in all of the entries for that account disappearing from Calendar completely, but nothing ever reappears even with the exchangesyncd process downloading gigabytes of data over and over again.

*as a side note, it appears that invitations that are generated by the Zoom Outlook plugin for Exchange (ie, invitations I receive from Outlook users with a Zoom meeting scheduled) are not recognized by Apple Mail as containing an actual invitation, so I can't even accept/reject those invitations using Apple Mail.

I just tested Ventura 13.2 beta and it is not solved, this is 2 months since apple recognize the Bug and said this Bug is high priority for Apple, It seem this is not true, when it is suppose Apple will solve?

Thanks

Best Regards

Bruno.

Not the same problem...if only it was that simple. I had another tech session with Apple on Friday and they installed a profile to log the problem through terminal. Fortuantely, the issue repeated when tested again while logging. Apple has that log, but so far no call back as to what the fix is going to be. The issue is with Apple calendar and not Exchange.

I solved this by going to https://outlook.office365.com/calendar/options/calendar/SharedCalendars publish the calendar, download the ics, open it on your mac and then add it to the same calendar that you're having problems on your mac. It worked like a charm. If you see duplicates, close the calendar app and open it again. I hope it helps someone.

things were working well, following the advice of @Wald02 to delete, reboot and re-add my outlook account to MacOS. Been going a couple of months. However, today I noticed two recurring meetings, sent by someone else, are in Outlook and not in Calendar. I'm on 13.2.1. I thought the work around was long term. I guess it's not. Diligence is important.

The exchangesync fix is not working for me. I noticed that after restarting the exchangesync process (kill worked fine, I didn't have to force kill), its continuously taking 30% of the CPU. So it appears to me that the exchange server is stuck on something.

Sonoma 14.6.1

Intel quad core i5 chip.