Learn how to activate Office that is pre-installed on new Windows 10 PCs or using a new product key.

If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product. After you enter your key, you can download and install …

Many tasks for Office products don't require a product key because your Microsoft account takes care of them instead.

Learn how to find your product key for Office 2010 or locate a lost Microsoft Office 2010 product key.

You can find the product key in one of the following locations: Sticker on the CD case or other packaging. Certificate of Authenticity. Confirmation email message received from an online purchase.

Learn how to activate Microsoft Office 2010 online, by phone, or on a different or restored computer.

Learn how to install, reinstall, or activate Microsoft 365 or Office 2024 on a PC or Mac.

Get help with product key errors, or geographical region errors, when you redeem a new Office product key on Office.com/setup.

How to change your product key to fix activation errors that can occur if you own and install multiple one-time purchases of Office..

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.