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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 commentLiz Gudiño commented
I need to use Outlook for work. I use my own Mac for work. I therefore use Outlook for Mac. It is beyond ridiculous that a version of Outlook specifically designed for the Mac platform does not support iCloud calendar sync. My work calendar is in Outlook. My personal and family calendars are in iCloud. I’d like to see both in the Outlook for Mac calendar rather than having to switch. This should be as straightforward as it is on iOS.Liz Gudiño supported this idea ·