Microsoft haven’t officially stated which upgrade paths are supported in Windows 8 but ZDNet do have the details leaked by partners.
According to the post Windows 7 users are going to able to upgrade to Windows 8 as long as you don’t switch architectures i.e. 32bit to 64bit. One thing to note is that if you have Windows 7 Home Premium and upgrade to Windows 8 (the standard edition) you will lose Windows Media Center and DVD Playback.
Users will be able to upgrade to Windows 8 Pro from Windows 7 Starter, Windows 7 Home Basic, Windows 7 Home Premium, Windows 7 Professional and Windows 7 Ultimate while maintaining their existing Windows settings, personal files and applications.
Users will be able to upgrade to Windows 8 Enterprise (available to volume licensees with Software Assurance contracts only) from Windows 7 Professional and Windows 7 Enterprise while maintaining their existing Windows settings, personal files and applications.
Users will be able to upgrade to Windows 8 from Windows Vista (without SP1 installed) but only personal files (meaning data only) will be maintained. If upgrading from Vista with SP1, personal data and system settings will be maintained.
Users will be able to upgrade to Windows 8 from Windows XP with Service Pack 3 or higher but only personal files/data only will be maintained.OO
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