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 …

To buy a brand new copy of Office, or start a new Microsoft 365 subscription, you can buy an Office product key card from a retailer. You can redeem your key at …

To use Microsoft 365 on your new device, you can activate Microsoft 365 as a 1-month trial of Microsoft 365 Family. You can also buy Microsoft 365 or a non-subscription version of Office, …

Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.

A product key is a unique alphanumeric code provided during the installation of Microsoft software (such as Windows or Office). It serves as a license key that validates your ownership of the …

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

Find your product key in the confirmation email you received after buying Windows 10 or Windows 11 in a digital locker accessible through the retailer’s website.

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

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

A product key is a 25-character code that's used to activate Windows and helps verify that Windows hasn't been used on more PCs than the Microsoft Software License Terms allow.