If the email is unavailable, you can log into your account and head to your history of Microsoft purchases here, and the product key should be available upon selecting your Windows 10 purchase. You purchased directly from Microsoft’s site: Microsoft will send you a confirmation email after you purchase, and the product key should be in that email. Keep all the documents that came with your PC and don’t take off any stickers that have the product key until you’ve used it. Typically, the product key is included on the Certificate of Authenticity, usually a sticker directly on the PC itself, or sometimes on the back of the manual. You bought a PC with Windows 10 already downloaded: This is fairly common, and in these cases the packaging and manuals are particularly important. Let’s break it down into the most common methods of purchasing Windows 10, and where you should look for the product key in each case. The issue is that this product key can come in many different forms, depending on how you bought Windows. If you bought an authorized copy of Windows 10, you will have received documentation that included your product key. Finding it can be a little tricky, however: If you aren’t sure where to look, here’s how to find the necessary key, and what to do if you think you may have permanently lost it. If you’re ready to active your Windows 10 device and fully unlock everything that Windows 10 can do - or you’re reinstalling Windows after some major hardware changes - then you’ll need that product key on hand.

Windows 10 digital product key