There is no difference in project files (.vcproj) except the version number, you can easily open projects created with VS2005 in VS.NET 2003 by modyfing the version number of the project using the text editor.

IMPORTANT
Unfortunately, solution files (.sln) in VS2005 and VS.NET 2003 have different formats and there is no utilities available to convert solution files from VS2005 to VS.NET 2003 format. So you must create a new solution in VS.NET 2003 and then add converted projects.

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STL containers like vector or list are harder to debug in the VS.NET 2003, because the VS.NET 2003 Debugger has no direct support for STL containers in the Watch window.
Instead you have to work with the members of the corresponding container types.

Here is a couple of tricks on how you can view the content of STL vectors and lists.
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