Windows Vista Professional editions - Vista Business, Vista Enterprise & Vista Ultimate

by Rinku

Windows Vista Business

The name suggests that it is designed for business market. It includes all the features of Home Basic with the exception of Parental Controls and the Windows Vista Standard theme. This edition can join and participate in a Windows Server domain. It includes Internet Information Services, fax support, Rights Management Services client, Encrypting File System, system image backup and recovery, Offline Files, a single user Remote Desktop server, ad-hoc P2P collaboration capabilities, Shadow Copy support which provides access to previous versions of files, support for Tablet PCs, and other business oriented management features. The Vista Business edition supports up to two physical CPUs.64-bit Business supports 128 GB of RAM.

Windows Vista Enterprise

This edition targets the enterprise segment of the market: it comprises a superset of the Vista Business edition. Additional features include support for Multilingual User Interface (MUI) packages, BitLocker Drive Encryption, and UNIX application-support. Not available through retail or OEM channels, this edition will get distributed through Microsoft Software Assurance (SA). Since Vista Enterprise classes as a benefit of Microsoft Software Assurance, it includes several SA-only benefits, including a license allowing the running of up to four virtual machines running a mix of Vista editions and versions, access to Virtual PC Express, and activation via VLK.13 Vista Enterprise supports up to two physical CPUs. 64-bit Enterprise supports 128 GB of RAM.

Windows Vista Ultimate

Windows Vista Ultimate combines all the features of the Home Premium and Enterprise editions, plus "Ultimate Extras". 64-bit Ultimate supports 128 GB of RAM.
Microsoft also makes an upgraded variant of Windows Vista Ultimate available: Windows Vista Ultimate Upgrade Limited Numbered Signature Edition. This limited, numbered edition of Windows Vista Ultimate features Bill Gates' signature on the front of the packaging along with its unique number; Microsoft plans to produce only 25,000 copies of this edition.

Note - The above information is taken from Wikipedia site.