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 …

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

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

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 …

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.

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

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

From the Overview page, select Office apps and on that page, find the Office product you want to install and select Install. To install Office in a different language, or to install the 64-bit version, …