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Besides what is referred in sibling posts:

- DirectX debugging tools, including GPGPU

- Parallel code debugging

- MFC and ATL for those that still need to support such type of applications

- 64 bit compilers

- DDK integration

- Sharepoint integration

"Debug / Attach to process" is another really significant feature that Community Edition has that was omitted from Express

Also templates for Windows Services and other project types that aren't included with the express versions.