An error occurred while saving the commentJoel Carlin commented
This feature is available to me on iOS, iPadOS and Outlook Web mail for all my email accounts, it is inconceivable to me that it is only available in my gmail account on my Mac version of outlook. Please make this change.
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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: