Microsoft spells out upgrades to Vista
TechWeb | at | by Mike
Microsoft has posted a page to its Windows Vista site that sorts out upgrade options for users of Windows 2000 and Windows XP.
"Certain legacy OSes require a full system installation while others will allow for an in-place upgrade," said Vista program manager Nick White on the team's blog. "Depending on where you're coming from and where you're going, you should determine which scenario applies to you."
A chart on a page titled "Upgrade Planning for Windows Vista" details upgrade paths, and notes who will be able to install Vista overtop an existing OS and who will have to scrub their hard drives before switching to the new operating system.