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. Vista Enterprise supports up to two physical CPUs. 64-bit Enterprise supports 128 GB of RAM.
|Component of PC||Vista Capable||Vista Premium Ready|
|Processor||800 MHz||1 GHz|
|Memory||512 MB||1 GB|
|Graphics card||DirectX 9.0 capable||DirectX 9.0 capable and WDDM 1.0 driver support|
|Graphics memory||64 MB||128 MB|
|HDD capacity||40 GB||80 GB|
|HDD free space||15 GB|
|Optical drives||DVD-ROM drive (Only to install from DVD-ROM media)|
Physical memory limits
Maximum amount of RAM that Windows Vista can support varies, depending on the both its edition and its processor architecture, as shown in the table.
|x86 (32-bit)||x64 (64-bit)|
|Ultimate||4 GB||128 GB|
|Home Premium||16 GB|
|Home Basic||8 GB|