Hi,
we're still on .NET 3.5, but would like to eventually move to .NET 4.0. The current release 2013.1 clearly does not support .NET 3.5 any more. Thus, two questions:
Version 12.1 supports every .NET version after 2.0.
v12.1 is the latest to support .NET 3.5 version. v11.1 and above support v4.0 of .NET.
Please feel free to let me know if a question about our tool set comes up on your mind.