Visual Basic is the most basic technology in Microsoft. However, if you are familliar with VB, it will be quite easy for you to understand asp, as well as SQL (I believe you have worked with SQL when using VB). And, you might probably worked with some COM components (or DLL calls). So, prepare your self to some other fields within Microsoft, like ASP(+), COM/COM+/DCOM, SQL, IIS. If you know these things well, and you have a good written resume, you will have no problem.