Exchange Calendar sync issues on MacOS

Hi shantisk,

Thanks for posting in Apple Support Communities.

We understand that Outlook and MacOS are not syncing calendar events and invites correctly. Since this is temporarily resolved with restarting the app, try removing the calendar altogether and adding it back to Calendar to re-establish the sync. These steps are from the article titled Add or delete calendars on Mac.

Add a calendar

1. In the Calendar app  on your Mac, choose File > New Calendar.

2. Name the calendar, then press Return.

If you can’t add a calendar for a particular calendar account, try adding a calendar on the account provider’s website. For example, to create a Google calendar, go to google.com.

Delete a calendar

1. In the Calendar app  on your Mac, click the calendar’s name in the calendar list.

2. If you don’t see the calendar list on the left, choose View > Show Calendar List.

3. Choose Edit > Delete.

4. Some calendars can’t be deleted.

* You can’t delete delegated calendars, but you can stop showing them in the main Calendar window. See Share calendar accounts.

* If you can’t delete a calendar for a particular calendar account, try deleting the calendar on the account provider’s website. For example, to delete a Google calendar, go to google.com.

* If a calendar account has only one calendar (not counting other people’s calendars you’re sharing), you can’t delete that last calendar.

Contact Apple Support if the behavior continues.

Contact - Official Apple Support

Regards.