Outlook 2016 for Mac is being updated for Office Insiders on the Fast Ring.
These Insider builds for Office 2016 for Mac provide new or improved features, security updates and bug fixes.
August 23, 2017 release changelog
Version: 15.38 (170822)
For those on the Fast ring of the Office Insider Program for Outlook 2016 for Mac, Microsoft has released a fast ring build and is now available for download on your Mac.
Office Insider builds for are updated on a regular basis to provide new or improved features, security updates and