Windows Vista Home Premium
Windows Vista Home Premium is the preferred edition for home desktop and mobile PCs. It provides a breakthrough design that brings your world into sharper focus while delivering the productivity, entertainment, and security you need from your PC at home or on the go. 

• Ready to buy? Download Microsoft Vista Instantly! Direct from Microsoft.
• Already have Windows Vista? Upgrade to Ultimate with Windows Anytime Upgrade

Vista Home Basic
Windows Vista Home Basic is ideal for homes with basic computing needs like e-mail, browsing the Internet, and viewing photos. Easy to set up and maintain, it enables you to quickly find what you're looking for on your PC and the Internet, while providing a more secure environment to help protect you from an unpredictable world. 

• Ready to buy? Download Microsoft Vista Instantly! Direct from Microsoft.
• Already have Windows Vista? Upgrade to Ultimate with Windows Anytime Upgrade

Windows Vista Business
Windows Vista Business is the first edition of Windows designed specifically to meet the needs of small businesses. You'll spend less time on technology support-related issues-so you can spend more time making your business successful. Windows Vista Business is the definitive choice for your business today and tomorrow. 

• Ready to buy? Download Microsoft Vista Instantly! Direct from Microsoft.
• Already have Windows Vista? Microsoft Windows Vista Anytime Upgrade Pack with SP1 [Business to Ultimate] with Windows Anytime Upgrade

Enterprise

Designed to significantly lower IT costs and risks, Windows Vista Enterprise meets the needs of large, global organizations with complex IT infrastructures. Learn more about Windows Vista Enterprise.

• Learn about the Microsoft Desktop Optimization Pack for Software Assurance