You copy and paste Microsoft Office 2016 activation key as below image: Microsoft Office 2016 Product Key Free 2021 Mainstream support ended on October 13, 2020, and most editions have extended support up to October 14, 2025.
Microsoft Office 2016 was released on macOS on July 9, 2015, and on Microsoft Windows on September 22, 2015, for Office 365 subscribers.
Microsoft Office 2016 (known as Office 16) is a version of the Microsoft Office productivity suite, succeeding both Office 2013 and Office for Mac 2011 and preceding Office 2019 for both platforms.