What's missing from Visual C++ 2010 Express?

Answer 1

http://www.microsoft.com/express/Windows/

Express versions don't have:

• Plugins
• Class Designer
• Code Analysis
• Creating 64-bit programs
• Creating for Itanium processors
• Creating for Windows Mobile
• Creating for Office using Visual Studio Tools for Office.

Express versions have but with limited functionality:

• External Tools
• Refactoring
• Debugging
• Integration with MSDN
• Installator Creator

Answer 2

There is also a special express build for Windows Phone 7 development.

http://www.microsoft.com/express/phone/

Answer 3

In addition to Svisstack's answer, express lacks support for MFC. This guy found a way to do MFC in VS2008e, but I have no idea if this hack works in VS2010e.