⚠️ Build 4266.1001 is outdated and does not include security updates released after 2016. Microsoft ended mainstream support for Office 2016 on October 13, 2020 , and extended support ended on October 14, 2025 .
Regardless of the minor version number, Office 2016 Professional Plus includes the full suite of desktop applications: Microsoft Office 2016 Pro Plus 16.0.4266.1001 V...
While mainstream support for Office 2016 ended on , and extended support ended on October 14, 2025 , many organizations continue running older builds for three primary reasons: ⚠️ Build 4266
Thus, the build you’re referencing is essentially a release, lacking many stability and security patches introduced later in 2016. Microsoft Office 2016 Pro Plus 16.0.4266.1001 V...