HP really wants people to buy a Windows 7 PC instead of a Windows 8 machine. The PC maker has been emailing customers over the weekend noting that "Windows 7 is back." A new promotion, designed to entice people to select Windows 7 over Windows 8 with $150 of "savings," has launched on HP’s website with a "back by popular demand" slogan. The move is clearly designed to position Windows 7 over Microsoft’s touch-centric Windows 8 operating system.

Great news for Microsoft.