Let's take a look at everything you need to know about Windows product keys. But what about all of your old licenses? Where are they? Where have they gone? And most importantly, are they actually of any use to you now? We've covered everything to do with Windows 10 licensing and activation, and it is now easier than ever to use your existing Windows 7, 8, or 8.1 license to secure your Windows 10 upgrade (until July 29, 2016). With that in mind, we thought it was high time to give you all chance to understand more about the 25 characters governing your system. You may have even found immense frustration as your product key and Windows didn't play ball. If you've used a Windows product in the past two decades or more, you've likely encountered a Windows product key. Feel free to copy and share this with your friends and family.
This guide is available to download as a free PDF.
