Ultimate, introduced with Vista, the loaded-with-goodies version aimed at hard-core hobbyists;

Business, introduced with Vista as the replacement to Professional for corporate use.

A Microsoft spokeswoman confirmed the five version names in the Windows 7 beta, but said they were only "preliminary."

"We will continue to take customer feedback from the beta test period into account as we refine the SKU set for Windows 7 and will share more information when we are further along the development path," the spokeswoman said in an e-mail.

Meanwhile, plans to make a single version of Windows 7 just for netbooks.