
To provide you with the best experience, Microsoft 365 for Mac support the three most recent versions of Apple's macOS, which are macOS 10.15, 10.14, and 10.13 currently.
So I suggest you upgrade macOS to install Microsoft 365 apps.
About "Which macOS version is the latest?", you may checkout the link "Find out which macOS your Mac is using".
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
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