What versions of Windows will .Net 4.0 support?

Question

What versions of Windows is Microsoft planning to support with .NET 4.0?

Answer 1

The official list is here.

Supported operating systems are:

• Windows XP (SP3)
• Windows Vista (SP1)
• Windows 7
• Windows Server 2003 (Base & R2)
• Windows Server 2008 (Base & R2, all editions, not supported in Server Core Role)
• Windows Small Business Server 2003 & 2008

Notable operating systems not supported include XP Media centre edition, XP Tablet PC edition and Windows 2000.

(The .NET Framework Client Profile is not supported on IA-64 systems.)

[Updated list for final release]

(see here (beta 1)) (see here (beta 2))

Answer 2

According to the .NET 4.0 Beta 2 download page, it's supported on Windows Server 2003, Windows Server 2008, Windows Vista and Windows XP.