The MS Office 365 product key is used to activate the licensed version of Office365. It is considered one of the best and most productive software available today. It includes full installation of Word, Excel, PowerPoint, and more. It started in June 2011 and now has the latest version as MS Office 2019. It allows users to do work on laptops and computers without having an internet connection. And in order to enjoy all these features, activation by key is inevitable. The key consists of a set of tools that are old but have many new features.