LINK : fatal error LNK1104: cannot open file 'libcid.lib'

Thanks TQN that worked a treat. No the project isn't ported over, is there any other big differences between these two version of VC++ that could cause me problems?

[SheepShagger]

Several differences in fact. With the introduction of Visual C++ .NET 2003 (VC++ 7.1) MS finally started to get their compiler closer to the C++ Standard. Is not there yet -specially in the template side of things- but is close. As you may expect, by doing that they also introduced a series of "breaking changes" and programs that used to compile with VC++ 6 or VC++ 7.0 won't necessarily compile with the newer version. The changes are in several areas and not just in the compiler itself. As TQN mentioned there are also changes in the standard, ATL and MFC libraries

For a list of issues check hxxp://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcedit/html/vcoriwhatsnewinvisualcnet2003.asp