First of all "Windows" itself doesn't mean an OS. You can argue that OSes have generic GUI windows, but Microsoft is not suing to prevent Gnome from calling its

First of all "Windows" itself doesn't mean an OS. You can argue that OSes have generic GUI windows, but Microsoft is not suing to prevent Gnome from calling itself a window manager with application windows. "Windows" is a trademark for an operating system. >So then, possibly an "app store" doesn't just mean a store on Main St, that happens to have applications on its shelves, but a novel concept worthy of a trademark? Well, store doesn't really mean only physical stores right? There are a bunch of online shops calling themselves stores from the 90s.