There are serious differences between Visual Studio 6.0 and 2002+
Most noteably is the User Interface, while yeah things are basically in similar places it all works differently enough to cause confusion.
Another HUGE difference are the Platform SDKs they support.
I'd say the best play to get Visual Studio 6 would probably be Amazon. You should be able to get a copy quite cheap.
Another option is going onto Microsoft.com, they used to provide the Visual C++ 6.0 compiler and standard libraries for free, which could be easily used with MinGW Developer Studio Editor (which is basically identical to VS6 IDE)... although god knows if Microsoft still provide this on their website, but I wouldn't be surprised if they did.
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