Windows 7 Home Premium

Windows 7 Home Premium is one of the two Windows 7 editions that will be sold worldwide to retail markets and OEMs. The other edition of Windows 7 is Windows 7 Professional.
Microsoft has build the editions to include features that "smaller" editions do not contain.
This is in contrast to Windows Vista where more expensive editions missed some of the features of less expensive ones.
Windows 7 Home Premium is a complete edition of Windows 7 unlike Windows 7 Home Basic or Windows 7 Starter which have been limited by Microsoft.
Here are the features that Windows 7 Home Premium will ship with that are not - or only partially available - in Windows 7 Home Basic and Starter.
Full Windows Aero support.
Home Group (Create & Join)
Multi-Touch
Premium Games
Windows Media Center
Windows 7 Professional
Windows 7 Home Premium will not support the following features that are available in Windows 7 Professional:
Windows Server Domain support.
Remote Desktop Server support.
Location aware printing.
Encrypting the file system
Presentation mode
Windows 7 Ultimate / Windows 7 Enterprise
Windows 7 Home Premium will also not support the following features that have been reserved for Windows 7 Ultimate and Windows 7 Enterprise.
AppLocker.
BitLocker Drive Encryption
BranchCache Distributed Cache
DirectAccess
Multilingual User Interface Pack
Virtual Hard Disk Booting