Microsoft will release six versions of the Windows Vista - three versions of Vista, will be for home users, two will be for businesses and one will be for emerging markets.
The six Windows Vista variants are: Windows Starter 2007; Windows Vista Enterprise; Windows Vista Home Basic, Windows Vista Home Premium, Windows Vista ultimate, and Windows Vista Business.
Windows Vista Ultimate
If you want all of the best business features, all of the best mobility features, and all of the best home entertainment features that Windows Vista has to offer, Windows Vista Ultimate is the solution for you.
Windows Vista Home Premium
Whether you choose to use your PC to write e-mail and surf the Internet, for home entertainment, or to track your household expenses, Windows Vista Home Premium delivers a more complete and satisfying computing experience.
Windows Vista Home Basic
Windows Vista Home Basic is designed to deliver improved reliability, security, and usability to home PC users who just want to do the basics with their PCs.
Windows Vista Enterprise
Windows Vista Enterprise is designed to meet the needs of large global organizations with highly complex IT infrastructures. Windows Vista Enterprise can help you lower your IT costs while providing additional layers of protection for your sensitive data.
Windows Vista Business
Regardless of the size of your organization, Windows Vista Business will help you lower your PC management costs, improve your security, enhance your productivity, and help you stay better connected.
Source: Windows Vista: The Versions