Hi Mark,

Yes, you're right, the .NET framework 3.5 is only supported the following
OS:

Supported Operating Systems: Windows Server 2003; Windows Vista; Windows XP

for windows 2000, I'm afraid it can not utilize the entire .net framework
3.5 runtime. However, if what you care is only the AJAX runtime, you can
consider installing the ASP.NET ajax separately. ASP.NET ajax is supported
for operating system that support .net framework 2.0:

#Installing ASP.NET AJAX
http://www.asp.net/ajax/documentation/live/InstallingASPNETAJAX.aspx

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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