Here is a quick view of the supported and unsupported upgrade paths for Windows 7 SKUs, that outlines possible upgrade scenarios from older versions of Windows.
Upgrade supported
| from Windows Vista (SP1 and SP2) | to Windows 7 |
| Ultimate | Ultimate |
| Enterprise | Enterprise |
| Business | Professional, Enterprise, Ultimate |
| Home Premium | Home Premium, Ultimate |
| Home Basic | Home Basic, Home Premium, Ultimate |
| from Windows 7 (lower editions) | Any Time Upgrade to Windows 7 |
| Professional | Ultimate |
| Home Premium | Professional, Ultimate |
| Home Basic | Home Premium, Professional, Ultimate |
| Starter | Home Premium, Professional, Ultimate |
Upgrade not supported
Upgrades to Windows 7 from the following operating systems are not supported:
- Windows 95, Windows 98, Windows Millennium Edition, Windows XP, Windows Vista RTM, Windows Vista Starter, Windows 7 M3, Windows 7 Beta, Windows 7 RC.
- Windows NT Server 4.0, Windows 2000 Server, Windows Server 2003, Windows Server 2008, or Windows Server 2008 R2
- Cross-architecture, Cross-language and Cross-SKU upgrades are not supported.
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