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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 commentDarren commented
This feature is a priority for those users looking to run a Mac with O365 as an alternative to a PC.
I can't get the alternative "subscription" to work for more than one ical. this makes a poor experience across devices