Caveat there Craig, I know you didn't speak for MM so thought I would throw this in. MM is not yet reported to be for VS2010 just yet although I think soon.

You can port your application from MM2.3 over to 3.6 and VS2008 but there may be some things you would want to sort out. Minor mostly.
Tim

>I can't speak specifically on MM.NET, but in general, yes. VS2010 (don't bother with 2008 at this point) supports multi-targetting. So, you can edit with VS2010 and target the .NET 2 runtime that shipped with VS2005.
>
>But I think what you're really asking is... Can you load the .NET 2 - targeted code and recompile in .NET 4? In general, yes. The .sln will be converted, but everything else *should* work.
>
>
>>Is there going to be any problems moving my application from MM 2.3 and VS 2005 to MM 3.6 and VS 2008 (2010)?
>>
>>Can I just copy the code to the new version?
>>
>>Are there any code changes that have to be made?
>>
>>Thanks.