As the Windows 7 is coming to MSDN, TechNet, and Connect subscribers on August 6th, it’s time to think about Windows 7 upgrade options again. Microsoft has also released updated Windows 7 upgrade paths info document that outlines some key factors that you need to remember while upgrading to Windows 7.
XP to Windows 7 in-place upgrade is not supported, but you can upgrade Vista to Windows 7.
Unsupported Windows 7 upgrade scenarios:
* Upgrade to Windows 7 from Windows 95, Windows 98, Windows Millennium Edition, Windows XP, Windows Vista RTM, Windows Vista Starter, Windows 7 M3, Windows 7 Beta, Windows 7 RC, or Windows 7 IDS is not supported.
* Also upgrade to Windows 7 from server operating systems such as Windows NT Server 4.0, Windows 2000 Server, Windows Server 2003, Windows Server 2008, or Windows Server 2008 R2 is not supported.
* Cross-architecture in-place upgrades (for example, x86 to x64) are not supported.
* Pre-release in-place upgrades across milestones (for example, Windows 7 RC to Windows 7 RTM) are not supported.
* Cross-language in-place upgrades (for example, en-us to de-de) are not supported
* Upgrades from Windows Vista to Windows N, Windows K, Windows KN, or Windows E are not supported.
* Cross-build type in-place upgrades (for example, fre to chk) are not supported.
* Cross-SKU upgrades (for example, Windows 7 N to Windows 7 K) are not supported.
Supported Windows 7 upgrade paths:
Be ready to upgrade your Windows to Windows 7 Enterprise, Home Basic, Home Premium, Professional, or Ultimate editions.