There's a software I developed a while ago to my bother for his business. The software was developed in Visual Basic .NET 2002 but it was a student proyect when I was in college. My brother and I realised that we could sell that software to several stores, but the thing is I have to get legal as my licence for Delphi 7 just expired and I currently don't have a licence for any version of Visual Studio. So I was wondering if I could port that app to something like C# 2008 Express Edition wich is free and sell it without worring about legal issues with Microsoft. Could someone please clear this up for me? Thanks in advance.

Can I use Express Editions for commercial use?

Thanks for your replies. Now I don't have to worry anymore.