MapXtreme2005 is available at www.mapinfo.com . It's version is 6.5.
MapXtreme2005 v6.5 is compatible with dotnet1.1 and Visual Studio 2003, This is the most important thing everyone should know:It is NOT compatible with dotnet2.0. So you can not use it under Visual Studio2005.
Another important thing: if u have installed mxt2004 and it is expired, you can NOT run mxt2005 on your computer.
Because the two "NOT" reasons above, I did not try it and I did not want to xp it.