Windows 7 Professional is a volume version of Windows 7 aimed squarely at mainstream business users and IT professionals. Building on Home Premium edition, it adds features like domain join, Group Policy (GP) controls, location aware printing, automated network backup, Encrypting File System (EFS), and offline folders. Windows 7 Professional is sold at retail and bundled with new computers.
These shots depict the final, shipping version of Windows 7 Professional.

The Windows 7 Professional default desktop.

Icons pinned to the default Windows 7 Professional Start Menu have a decidedly business-oriented feel to them.

Unlike lower-end Windows 7 versions, Windows 7 Professional supports automated network-based backups

Also unique to Windows 7 Professional (and up): Encrypting File System (EFS) support.

Windows 7 Professional supports Remote Desktop Host, letting you remotely access the PC and use it interactively.

Windows 7 Professional lets you add and remote components like Internet Information Services.

Unique to Windows 7 Professional (and up): Offline access to network-based files.

XPS Viewer and Windows Fax and Scan.

In addition to the Connect to a Project utility, Windows 7 Professional provides access to network-based projectors.

Windows Mobility Center.

Sound Recorder and Sync Center.

Resource Monitor.

Reliability Monitor, which is a bit more hidden than it was in Vista.
Source: winsupersite
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