Users have been asking how, when and if they will be able to upgrade directly from older versions of Windows to Vista. The official – and confusing – word on Vista upgrades is in. Inside Microsoft blogger Nathan Weinberg summarizes: “If you have Windows 2000 or a 64-bit version of XP, you’ll be installing from scratch. If you have XP Home, you can buy any version of Vista and perform an upgrade. If you have Professional or Tablet, you can only perform an upgrade to Business or Ultimate, otherwise you’ll need to install from scratch. If you have Media Center, you can only perform an upgrade to Premium or Ultimate, otherwise you’ll need to install from scratch.” Got that? Good.