Microsoft makes it as clear as mud, in my opinion. OEM, Upgrade, Retail, Full Version...any more cryptic and ARGUABLY MISLEADING product titles, are there?
I want a single Microsoft Windows 7 operating system that will install and run on any computer I own (I have more than one).
I want to reformat my hard drive and reinstall Windows 7 as many times as I find necessary on any of my computers. Virus protection software isn't 100% effective and it is sometimes easier to just reformat the drive and reinstall everything from CD or DVD.
I want a Microsoft Windows 7 operating system that belongs to me. I don't want Microsoft's permission to use or install it. I bought the software. It's paid for with my hard earned cash. If I buy it, is it not mine? Does Microsoft own my paid-for possessions or do I?
Here's the tricky bit, though - which of OEM, Upgrade, Retail, Full Version, Blue-With-Pink-Spots, Soft Centre or Crunchy Nut version of Windows 7 achieves all of the above? What's the Secret Microsoft Code for 'you buy it, you own it'?