Windows 7, a major release of the M

Windows 7, a major release of the Microsoft Windows OS, is available in six different editions (Starter, Home Basic, Home Premium, Professional, Enterprise and Ultimate). Only Home Premium, Professional, and Ultimate are widely available at retailers.[1] The other editions focus on other markets, such as the developing world or enterprise use. All editions support 32-bit IA-32 CPUs and all editions except Starter support 64-bit x64 CPUs. (64-bit installation media is not included in Home-Basic edition packages, but can be obtained separately from Microsoft).
According to Microsoft, the features for all editions of Windows 7 are stored on the machine, regardless of which edition is in use.[2] Users who wish to upgrade to an edition of Windows 7 with more features can then use Windows Anytime Upgrade to purchase the upgrade and to unlock the features of those editions.[1][2][3] Microsoft announced Windows 7 pricing information for some editions on June 25, 2009, and Windows Anytime Upgrade and Family Pack pricing on July 31, 2009.[1][4][5]