I've just purchased a T550 ThinkPad with this message in the offer for sale thread. I'll not have the T550 for maybe 5 days. It's an in warranty purchase and I'll have the 8.1 Recovery Media likely about the same time. I don't actually understand 'message' and would like to have maybe a head-start to plans that need to be made before 'end of year' W10 upgrade theoretically ends. I know that the PC BIOS has the 8.1 INFO and the PC wasn't delivered with the W7 PRO rights. Do I just attempt a W10 rebuild using the PC menu and hope for the best maybe expecting W10 PRO? Do I install the Recovery Media then do a build using the W10 PRO ISO? Is this maybe just a 90 day trial that the seller has done before the sale? I'm just really not familiar with the meaning of the message as to whether it's an "Enterprise W10 Edition" - a 90 day trial or just what. I apologize if it seems to be a foolish request but I've searched and don't find information that isn't confusing!!