With Windows Vista nearing its first release candidate in preparation for a final launch early next year, Microsoft is providing more details about possible upgrade paths. Of note: Windows 2000 cannot be upgraded to Vista.

While Windows 2000 Professional customers may purchase a cheaper "upgrade" copy of Microsoft next-generation operating system, Windows Vista must be "clean installed," which means users will need to back up their files and data manually and then copy everything into place. Applications will also need to be re-installed.

Microsoft Details Vista Upgrade Paths