Been almost exactly there in my previous job and I feel your pain. It took about 2 years for us to learn VB.NET well enough and get comfortable with what it could do and rebuild most of the code base. (I left with one component still left to do.) Mind you, we were also fairly busy on multiple customer projects at the same time. I don't normally comment, but thought I would make a note on serial comms. They are significantly different from VB6 and unless something has changed recently, you will want to build at least the serial components against .NET Framework 2.0. See here: http://social.msdn.microsoft.com/forums/en-US/Vsexpressvb/thread/3e64f562-e74b-4213-8019-e69f54fc0d74/[^] Also, this site will provide you with a significant head start on the serial side: http://www.innovatic.dk/knowledg/SerialCOM/SerialCOM.htm[^]