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1.Please confirmwhether this issue on the OWA, if the process goes well, it means the sharedcalendar is ok. The issue may be related to the Outlook client synchronization.You could also try to share this problematic calendar via OWA to check theissue.

2.Navigate toOutlook, File--Options--Advanced--Send and receive. Check box to sendimmediately when connected, in Send and Receive options the calendar isincluded.

Sync basics - what you can and cannot sync Outlook 2016 Outlook 2016 for Mac Outlook for Mac 2011 Outlook on the web for Office 365 Business Outlook.com Outlook Mail for Windows 10 Outlook on the web for Exchange Server 2016 More. May 20, 2019 Microsoft Outlook 2016 for Mac and Outlook for Mac 2011 does not update your Microsoft Exchange calendar when you accept a meeting request without sending a response. Cause When you accept a meeting and then select Do not Send a Response, Outlook for Mac updates your local calendar with the acceptance only, it does not update the acceptance on. Nov 18, 2016  To solve it, in calendar if you go to preferences, accounts, delegation, then click add, type the person's exchange e-mail address, it will load and populate their calendar as a new calendar in the Mac calendar app. That being said, the Mac calendar app is really not up to par for business.

3.Navigate toOutlook, File--Account Settings, click change, more settings, advanced tab,uncheck Download Shared Folders. After that restart Outlook. Observe is theproblem reoccurs.

4.For theproblematic user, it is suggested that removing and reassign the rights andsharing the calendar again.

5.Ifthe issue still exists,update theOutlook version to the latest one to check it, or turning offthe Cache Exchange Mode to resolve it.

Office 365 Calendar Not Syncing With Iphone

Office 365 Calendar Sync Issues