For Windows Mobile, you might be able to get away with the old free Embedded Visual C++ (eVC++) and Embedded Visual Basic (eVB) tools. I don't know how well the

For Windows Mobile, you might be able to get away with the old free Embedded Visual C++ (eVC++) and Embedded Visual Basic (eVB) tools. I don't know how well they will work, and you probably won't be able to take advantage of the latest features. You could potentially do development with the C# command line tools. But that is probably extremely difficult Otherwise you will need Visual Studio.