Internet access is required to install and activate all the latest releases of apps and services included in all Microsoft 365 subscription plans. Note that if you are an existing subscriber, you do not need to reinstall or purchase another subscription.

For Microsoft 365 plans, Internet access is also needed to manage your subscription account, for example to install Office apps on other PCs or to change billing options. Internet access is also required to access documents stored on OneDrive, unless you install the OneDrive desktop app.

You should also connect to the Internet regularly to keep your version of Microsoft 365 up to date and to benefit from automatic upgrades. If you do not connect to the Internet at least every 31 days, your apps 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 apps, simply reconnect to the Internet.

You do not need to be connected to the Internet to use the Office apps, such as Word, Excel, and PowerPoint, because the apps are fully installed on your computer.