Updateing to Office 365
I'm trying to update to Office 365. I get the message "This software requires macOS version 10.13.0 or later." I have High Sierra 10.13.6
At this moment in time, Microsoft requires the installation of macOS Mojave (10.14.n) before Microsoft 365 applications can be installed. You can verify this from the Mac App Store entry for Microsoft 365 applications. Scroll down to Compatibility and click on it: