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.

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.

I tried everything suggested here with no success before updating to Ventura 13.2 (released on Jan 23rd).

What eventually worked for me after updating to 13.2 was deleting my Exchange account, re-adding it, waiting a few minutes to see if it would update, trying CMD+R to manually sync without success, then toggling "calendar" off and on in Settings->Internet Accounts->Exchange Account. When "calendar" was toggled back on it synced successfully.

Hope this helps.

Deleting the exchange account and adding it back in worked for me (on iMac 2019, Ventura 13.3.1) without rebooting even. In detail, this is what I did:

1. Quit anything that uses the Exchange account, ie. iCal, Mail, etc.
2. System Settings --> Internet Accounts --> "Exchange" --> Delete Account
3. System Settings --> Internet Accounts --> Add Account (no need to reboot before adding it back in)
4. Reopen iCal - everything seems to be syncing fine now!

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.

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

I'm on Ventura 13.2, had the same issue. It was resolved as said Wald02: completely eliminated the Exchange account (System Settings --> Internet Accounts --> "Exchange" --> Delete Account). Without Reboot Mac. In 2-3 minutes the Calendar was synchronized and becomes to receive the new messages from Outlook.

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 -

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 (using "crontab -") will clear out any existing cron jobs. Better to edit with "crontab -e" and adding this line that way.

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....

I can confirm that this works! Delete the exchange account, reboot, re-create the exchange account, all will sync. In the first few minutes the calendar will not sync but after 10 minutes it will be re-synced. Don't know yet if it will keep on syncing new items but this seems hopeful!

For me, it works by setting a cron as follows:

1) open Terminal and type crontab -e

2) paste this line "*/15 * * * * launchctl stop exchangesyncd && launchctl start exchangesyncd"

3) Save

This fixed all my issues without side effects.

I've just solved it by myself changing a paramenter in Calendar. Go to Calendar/Settings/Accounts/Exchange and change Refresh Calendars from Push to Manually. In my case it worked perfectly and after one week it's still working fine. Hope it helps.

Note that I'm very disapointed with Apple because they have done nothing helping me with the already opened support ticket (my mac is under Apple Care for Enterprise contract). I had to call them four times and three of them they said "You must update to Sonoma". I said "It wasn't possible because I've just updated to Ventura two weeks ago wich is the approved version from my company to be used". They've had a lot of time without any solution. They fail again to call me back last time and, even when I've sent an email, they didn't reply any more.