Internet access is required to install and activate all the latest releases of Office suites and all
Office 365 subscription plans. For Office 365 plans, Internet access is also needed to manage your subscription account, for
example to install Office on other PCs or to change billing options. Internet
access is also required to access documents stored on OneDrive, unless you install
OneDrive desktop app. You should also connect to the Internet regularly
to keep your version of Office up to date and benefit from automatic upgrades.
If you do not connect to the Internet at least every 39 days, your applications
will go into reduced functionality mode, which means that you can view or print
your documents, but cannot edit the documents or create new ones. To reactivate
your Office applications, reconnect to the Internet. You do not need to be connected
to the Internet to use the Office applications, such as Word, Excel, and PowerPoint,
because the applications are fully installed on your computer.