You can run Windows 7 indefinitely without a license, too.
You get a nag every now and then, and the desktop background keeps resetting to black. Can't remember if there's a watermark as well (10 has a watermark).
I had myself a hearty laugh recently when I was in Vegas and the casino elevator wall screen panels had the ACTIVATE WINDOWS banner overlaid on the videos.
You get a nag every now and then, and the desktop background keeps resetting to black. Can't remember if there's a watermark as well (10 has a watermark).