By the time version 16.17 rolled around in late 2018, the suite had matured significantly. It was no longer the buggy, unstable initial release of 2015. It was a robust, polished environment. Version 16.17 was effectively the "final form" of this era—stable, secure, and fully compatible with the macOS High Sierra and Mojave environments of the time.
Microsoft Office for Mac version , released in September 2018, was Microsoft Office 2016 for Mac 16.17
Because version 16.17 is no longer the default download (Microsoft pushes Office 2019 or Office 365 now), finding a legitimate copy requires effort. By the time version 16
The Bridge to Modernity: Reflecting on Microsoft Office 2016 for Mac (Version 16.17) Version 16
Version 16.17 was part of a major architectural shift. Earlier versions of Office 2016 utilized the 15.xx build number. When Microsoft pushed the suite to 16.xx, they essentially aligned the Mac code more closely with the universal Office codebase. For users, this meant faster performance, better stability, and—crucially—the introduction of collaborative features like real-time co-authoring in Word and Excel. It turned the Mac from a standalone workstation into a collaborative hub.