Windows 7 increasing adoption: there must be a reason

From what I've read on the Web and sometimes in the printed press, Windows 7 has gotten a great reception from all camps, namely, users of previous Windows versions and, interestingly enough, some (may be a few, may be a good number) Apple and Linux users. Notice that when I say "adoption" I don't mean to say "switching to". I can easily adopt Linux and Apple, if need be, since I can see their own obvious merits. I came across an interesting comment by Adrian Kingsley-Hughes, aka The PC Doctor, a heavy user of different systems and OSes, in which he shares that his default OS is Windows (does not state which one, though), but simply because Windows is the most widespread OS and that it would take for the rest of the world to switch to Linux in order for him to follow suit. Adrian's attitude is simply "I’ve got better things to do with my day that to become a cheerleader for one corporation or another." Same here, though you may think why do I have a Windows 7 (and also a Windows Vista) blog. Well, simply because I "adopted" them as my everyday primary PC tools, after using Windows XP, 2000, 95, 3.1, DOS and my first computer experience: Apple Macintosh (beautiful machine and OS, I have to say).