What is the difference between CString in vc6 and vc7?

CString was removed from MFC in VC7 so that it can be used in both MFC projects and ATL. The architecture has completely changed:

• In VC6, CString did not have a base class. In VC7, the base class is CStringT <TCHAR>, which comes from CSimpleStringT <TCHAR>.
• In VC7, you also get CStringA and CStringW for explicit char and wchar_t strings.

I don't know of any difference in behavior between the two, but the documentation is much easier to use in VC6. The methods are scattered among the base classes in VC7.