the software is genuine but it is for business use and not home.
...meaning that it was probably volume licensed rather than an individually licensed retail product.
Microsoft has presumably blocked the leaked key. If the key to any Microsoft product can be found on the internet in a google search, there is the possibility that it will be blocked in future.
This may require a reactivation requiring that the means by which the product was obtained will need to be disclosed. This can be checked against entries in the BIOS Software LICensing (SLIC) Description Table, the Hardware hash key and Product key, as well as previous registry entries for Windows Activation, and other stored licensing records in your Windows system.
If I'd bought something in good faith, and I found out it was not kosher, I would be rather annoyed and would be doing everything I could to get my money back from the merchant who supplied it. I would probably report them to all and whichever agencies I could to stop them doing it again to other dupes. I would then go to a legitimate source and purchase the item I should have in the first place.
If on the other hand, I had knowingly bought something dodgy, on the cheap, I would now be feeling foolish for being conned, and thinking of going to a legitimate source to get the item I should have bought in the first place.
On the third hand, if I were incorrigibly dishonest, I would be scouring the internet for some site that offered a crack that would seemingly make my fake purchase seem genuine again. Only I would know the difference, until the day my computer again greeted me with "Your Windows is not Genuine..."
It seems strange to think that there is some sort of difficulty in finding an honest supplier of genuine Microsoft products in the UK. Major retailers from electrical goods suppliers through booksellers and supermarkets all sell the stuff, and have reputations to uphold.
There are reputable online retailers too, but on Ebay there are ephemeral traders that do not have a great reputation as far as genuine licensed software is concerned.
