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One alternative is to subscribe to iCloud calendar with your Exchange/O365 email accounts or any Outlook account, and then sync the same accounts in Outlook for Mac. See details:
An error occurred while saving the commentphil commented
not sure why u would sell an office for mac and not be able to auto-sync with the iCloud calendar as most of the entries are done on the iPhone and have to be manually synced this also applies to the contacts I might as well continue using the iCloud stuff which does all this