You can also download Visual Studio 2013 Community for free now. Community is far more powerful than the old Express edition (they say it has all the features as Professional.) You'll find it easier to work on things if you're using a proper setup. We're also more than happy to provide a free license for ReSharper to those that try and contribute to the project.
FYI, the ServUO project will soon be updated to Visual Studio 2013 (aka Visual Studio 12.)