Mac Calendar not syncing with Exchange on Ventura

macOS 13.4 fix found!

We've had this problem for multiple client devices since macOS Monterey. Back then we had a fix that worked however since macOS Ventura, no fixes have worked.

Since updating to macOS 13.4 the following fix works:

1. Close Outlook, Mail and Calendar apps
2. Open Activity Monitor
3. Force quit the process called "exchangesyncd"
4. Relaunch the Calendar app and give it a few minutes

This issue has caused us a lot of nightmares so hopefully this works for you all.

It is not fixed in Sonoma either.

Same here; still broken on Sonoma 14.0: A particular Exchange/Outlook invite shows up on my iOS devices but none of my 3 Macintosh Apple Calendars. I have done pretty much everything suggested in this and similar threads.

Frustrating!!!!!!!!!!!

Apple, we turn our lonely eyes to you....

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.

If you want to put this behind you via the exchangesyncd restart fix, just run this in a terminal to have cron restart the process at the top of every hour:

echo "0 * * * * killall exchangesyncd" | crontab -

I am now on the latest and greatest Sonoma 14.2.1 (as of this post) and its still not fixed after several generations of operating system releases. This seems to be the way for now until apple decides to fix this.

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...

Oh, i think you forget the last step:

5. Do this every morning.

I don't know if this will be a permanent fix, but here we go:

• My problem was that Mac Calendar would sync SOME of my calendar events from our Exchange server (generally invites from others and repeating events) but not one off events created by me.

• I removed the Calendar account from the Systems Settings/Internet account but left my other Exchange accounts like Mail untouched.

• I added back the Calendar account, opened Calendar, and then in Calendar Settings/Accounts, I set "Refresh Calendar" to "every Minute". That seemed to force the application to retrieve the missing calendar events.

Am crossing my fingers to see if this is a permanent fix. Not holding my breath....

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.

For those of you for whom force-quitting exchangesyncd, restarting, or removing the offending Exchange account didn't work, try the following: with both Calendar.app and Activity Monitor.app open, in the latter search for and force-quit CalendarAgent. Quit both Activity Monitor and Calendar. Then reopen Calendar. This worked for me; my misbehaving Exchange calendars refreshed with updated events shown and deleted events gone. A rare thanks to a Mac Enterprise Admin a college in the MS community: https://answers.microsoft.com/en-us/outlook_com/forum/all/apple-calendar-is-not-syncing-outlook-calendar/ba3ed958-05dd-4d48-b4bf-6ebb6cff99f3

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

The behaviour of the calendar app is really strange. The problem seems to be localized only to the calendar application on macOS in connection with the local Exchange server.

Calendar on MacOs will allow you to create an event that is almost instantly synced to iOS. Similarly, an event created on iOS will appear on macOS after a while. This is apparently provided by iCloud sync.

After removing and re-adding an Exchange account, past and current events are not loaded. After restarting the Exchange server, the synchronization process works for a while, but then stops. Sending meeting invitations does not work. It is also not possible to reply to incoming invitations.

Please provide a quick fix or rollback to the previous version, which worked without problems with Exchange sync!

Two solutions here so far. For some people, removing the Exchange account and re-installing it works. It did not change anything for me. The other solution that work but is super annoying is the periodically quit the exchangesyncd process.

To do so, close Calendar, open the Activity Monitor app, search for exchangesyncd and force quit the process, wait couple of seconds, reopen Calendar.

This sounds similar to local (USB and wifi) sync, without the clouds, like in

https://talk.tidbits.com/t/my-mac-apple-calendar-went-berserk-i-need-help/23878/39

Calendar sync to iPhone or iPad using USB… - Apple Community

https://discussions.apple.com/thread/254549186

https://discussions.apple.com/thread/254463571

Sync Issue with my iPhone and MacBook Pro - Apple Community

https://discussions.apple.com/thread/254890299

https://discussions.apple.com/thread/254876661

etc. Even Sonoma doesn't fix it (crashes). What's up, Apple? Its SQA is really bad. :(