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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:Nick supported this idea ·Nick commented
Can you make it so Outlook on Mac can follow basic protocols to work with Apple calendar so we can see and edit and synch. What is worse is making it seem like it does work, but then it doesn't (it shows up on the left menu bar but none of the appointments show up) I have spent many hours trying to make my wife see that Im really trying to be a good husband but I cant get the family calendar into my work calendar...save the family!