Microsoft Office 2021 (Third perpetual release of Office 16) is a version of the Microsoft Office suite of applications for the Microsoft Windows and macOSoperating systems. It is the successor to Office 2019, and was released on October 5, 2021, shortly after the completion of Windows 11. As a third perpetual release of Office 16, office 2021 remains same version number as its 2 predecessors. It introduces new dynamic arrays, XLOOKUP features for Excel, full dark mode support, and performance improvements. Support for retail versions of Office 2021 will end on October 13, 2026; unlike older versions of Office, there is no extended support period.