To make ASP.NET 2.0 project which use ajax extensions work on Windows 2003 Server you need to install AJAX extensions first:
This is the correct version to use: ASP.NET AJAX 1.0 (file ASPAJAXExtSetup.msi)
You can download it here: http://www.microsoft.com/en-us/download/details.aspx?id=883
If you experience problems with ajax menu under IE9 like not working on hover you must also apply this patch:
NDP20SP2-KB981201-x86.exe
This is the correct version to use: ASP.NET AJAX 1.0 (file ASPAJAXExtSetup.msi)
You can download it here: http://www.microsoft.com/en-us/download/details.aspx?id=883
If you experience problems with ajax menu under IE9 like not working on hover you must also apply this patch:
NDP20SP2-KB981201-x86.exe