Outlook 15.6.1 represents a transitional phase for Microsoft on the Mac. After years of the clunky, Windows-ported Outlook 2011, version 15.x marked the first truly “Cocoa-native” Outlook for Mac. Update 15.6.1, released in April 2016, was primarily a stability and bug-fix release for the 2016 suite. It is not the modern “New Outlook” and lacks many features of Outlook 365 or Outlook 2021.
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This version is known to have issues on newer macOS versions like Monterey (12.7.1) , Ventura , and Big Sur . Users on these systems may find that version 15.6.1 fails to open or sync correctly. Microsoft Outlook 15.6.1 For Mac Download