Office 365 is a subscription service from Microsoft that gives you the most up-to-date versions of the Office applications. Office 365 is not limited to the free Office Online apps. You use your Office 365 subscription to download and install the full versions of Word, Excel, PowerPoint, and, depending on your subscription, Access. There are Office 365 plans available for home and personal use as well as school and business. Depending on the type of Office 365 subscription you have, you will receive feature updates monthly or twice a year.