I am developing a product , that I would like to compile
in different development environments.

So if I have to include any header file
specific to VC++ 2003 implementation, I would
like to put them in a guard something like  -

#ifdef  <VC++.NET 2003 specific symbol here>
  #include <customerheader1.h>
#endif

Can anyone let me know what is the symbol that we use for
identify VC++ .NET 2003 implementation.

 I used the symbol -  ' __VISUALC__ '. That does not seem to help.
 
 Thanks for letting me know.