v tomhle nástroji rohatýho: https://www.microsoft.com/en-US/download/details.a spx?id=11936

Works on Vista keys onwards (Win 7, 8, 2008 Server...).

While VAMT is essentially a central key management tool meant to license computers, you can use it as an "official key checker" of sorts.

Just click on the Product Key option on the left, type your product key and click on Verify. f the key is valid you'll get Edition, Description and Key type.