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

If Office is prompting you for a product key, and you want to buy a product key to activate Office, it's better to uninstall your current version of Office and then buy and install a new version of …

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

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.

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

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

Important: Office 2007 is no longer supported. Learn how to upgrade to a newer version. If you still need to install this version, you'll need an Office 2007 installation disc and a product key …

Khóa Tài khoản Microsoft sẽ thay thế khóa sản phẩm của bạn cho nhiều tác vụ, chẳng hạn như kích hoạt Microsoft 365 cài đặt lại Microsoft 365. Câu hỏi thường gặp về Microsoft 365 khóa …

In summary, a product key is used during installation, while an activation code is used to activate the software afterwards. Both are essential for ensuring a legitimate and functional software …