Many legacy systems require specific update builds to maintain compatibility with older macros or plugins. The March 2017 update set is often viewed as a "golden image" for offline workstations.
Mainstream support for Office 2016 ended years ago, and extended security support officially concluded on October 14, 2025 . microsoft-office-2016-proplus-with-mar-2017-updates
Support for Office 2016 and Office 2019 ended on October 14, 2025 and there will be no extension and no extended security updates. Microsoft Support Many legacy systems require specific update builds to