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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:Terry Hatmaker commented
How long will this be in review? I would think it should be a given to support Apple Calendar or Apple Contacts in Outlook for macOS.
5,205 votesTerry Hatmaker commented
I have been waiting for ever for this feature. I am starting to think that Google Suite may be the way to go.