Mac Calendar not syncing with Exchange on Ventura

I tried both the exchangesyncd quitting and calendaragent thing. Nada. The only thing that worked (finally!) was to just delete and then add back Exchange account. Is this like some psyche experiment Apple and Microsoft are running to see just what we mice will do to get out of this maze?

This worked for me, though I set it to just run every morning at 9am with:

0 9 * * * killall exchangesyncd

But setting up the job like this will clear out any existing cron jobs. Better to edit with "crontab -e" and adding this line that way.

Just found this problem too.

Best fix is to remove your exchange account from your apple 'cloud services' section in Settings, then re-install it. Works fine now.

Just updated to Mac OS Ventura 13.3. After that I deleted my Exchange account, rebooted and re added the Exchange account and now Calendar app is syncing perfectly.

The workaround I found, beside restarting the Mac, is to to quit the exchangesyncd process through the Activity Monitor app. Then it restarts itself automatically and Calendar starts syncing again for a while.

I'm on the latest Ventura build.

I did the same steps of deleting accounts, reboot and re-add on 13.1. All seems to be synching again. But I remain gun shy.. I keep going back and forth between Outlook and Calendar to ensure it's still good.

I tried this and neither solution worked. My exchange calendar will only sync if I delete it and reinstall it on my mac. I can get everything just fine on my iphone and ipad but not on my mac. Super frustrating and needs to be fixed asap.

This has been an issue for years.

I have never had an O365 <--> macOS Mail.app sync reliably. As the original poster says, my iPhone for whatever reason is not affected.

Fixes vary, from killing com.apple.CalendarAgent, to completely deleting my Exchange account from Calendar and re-adding.

I'd like to avoid installing Outlook for Mac altogether, given that Mail.app seems to handle my O365 account without much issue. It's just calendar.

I have been fighting off and on with this sync issue. Just wanted to say that it is still present in 14.5. I did close Calendar, stop the process "exchangesyncd" and after "exchangesyncd" started up again I opened Calendar and all was good (for now).

I had this problem too. What sorted it for me was:

On Outlook click on Outlook > Settings. Select Accounts. Select the affected account (if you have more than one). Click the down arrow to the right of the small circle with the 3 dots at the bottom left of the window. Select Reset Account. Restart Outlook and it should repopulate correctly in a few seconds. You can also do this on Outlook on iPhone as well. Hope that helps.

Unfortunately the same issue for me. I seemed to have solved it (while still on Ventura) by ensuring my default calendar was the exchange calendar I use.

However, after upgrading to Sonoma my Mac OS calendar using my exchange account is completely unreliable because certain events do not update. It looks "mostly ok" but added or deleted events get missed.

I hope this can be solved soon. Linking another thread that just started in case anyone else wants to chime in here too: iCal NOT grabbing MS Exchange calendar da… - Apple Community

So I'm curious if you're all seeing the same/similar symptoms as I am:

1. Exchange calendar items are all loading correctly initially into the MacOS Calendar when first adding the account
2. Invitations show up in the "inbox" panel with only "OK" option instead of "Accept/Decline/Tentative" (Not mentioned on this thread, but I've read other threads elsewhere where people are experiencing this issue also.)
3. Changes on MacOS to calendar (adding new meetings, accepting, declining, or removing meetings) do not sync to exchange server
4. Subsequent changes to exchange calendar do not sync to MacOS Calendar

I tried the "full blowup" treatment:

1. Delete exchange account
2. Delete Calendar.sqlitedb* files
3. Reboot
4. Wait for other non-exchange calendars to sync
5. Add exchange account and wait for sync

Alas, I'm right back where I started.

This is seriously broken Apple folks...

One workaround I found was to use Calendly to set appointments on my Outlook calendar. For some reason, this applies them to my outlook and apple calendars together. Still a bandage and not a fix, but its working better than all the reboots