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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 commentDave commented
I have just subscribed to Microsoft 365, and was surprised to see that this integration doesn’t exist. As someone fully integrated in the Mac ecosystem, I use Mac Reminders and Calender - it’s crazy that Outlook for Mac can access iCloud Mail, but not these other key aspects. Until this glaring hole is filled, I will have no choice but to ditch Outlook.Dave supported this idea ·