A one-time purchase
Install on one PC
Classic Office apps
Classic apps for business
Microsoft 365 is a subscription that comes with premium apps like Word, Excel, PowerPoint, OneNote, Outlook, Publisher, and Access (Publisher and Access available on PC only). The apps can be installed on multiple devices, including PCs, Macs, iPads, iPhones, Android tablets, and Android phones. Microsoft 365 also comes with services like 1 TB of OneDrive storage, 60 Skype minutes per month, and Microsoft chat and phone support. With a subscription, you get the latest versions of the apps and automatically receive updates when they happen.
Office 2021 is a one-time purchase that comes with classic apps like Word, Excel, and PowerPoint for PC or Mac, and does not include any of the services that come with a Microsoft 365 subscription. One-time purchases don’t have an upgrade option, which means if you plan to upgrade to the next major release, you'll have to buy it at full price.
Learn more about the differences between Microsoft 365 and Office 2021 in Office Support, or use the comparison chart to help you pick the right Office version for your needs.
To see if your computer, mobile device, and/or browser can run Office, please visit the Office system requirements page.
Internet access is required to install and activate Office, but not to use Office apps such as Word, Excel, and PowerPoint once you have these fully installed on your computer.
Once you have purchased Office, you can install it from the Services & subscriptions section of your Microsoft Account page.
Go to Office Support for more steps to download, install, reinstall, activate, or update Office.
People using Microsoft 365, Office 2021, Office 2019, 2016, 2013, 2010, and 2007 as well as Office for Mac 2011 and 2008 will be able to open and view your documents, but those on earlier versions may need to install a compatibility pack.
Yes, the Microsoft 365 Training Center has quick start guides, cheat sheets, tips and tricks, and training courses on how you can make the best use of Office.
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 Publisher and Access for PC only.