Internet access is required to install and activate all the latest releases of Office suites and all Microsoft 365 subscription plans. For Microsoft 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. It is also recommended you connect to the Internet regularly to keep your version of Office up to date and benefit from automatic upgrades.
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.