Since October 31, 2013, Windows 7 is no longer available in retail (except for the Professional edition preinstalled which was discontinued on October 31, 2016). Still, Windows 7 is the most used windows up to date. Even now the computers are more equipped with unique windows 7. Here are the Windows 7 versions. These all Versions need Windows 7 Activation keys to activate and work perfectly still on these times too.
Windows 7 Starter
Windows 7 Starter is the edition of Windows 7 that contains the fewest features. It is only available in a 32-bit version and does not include the Windows Aero theme. The desktop wallpaper and visual styles (Windows 7 Basic) are not user-changeable. In the release candidate versions of Windows 7, Microsoft intended to restrict users of this edition to running three simultaneous programs, but this limitation was dropped in the final release. Does not support more than 2GB of RAM.
This edition was available pre-installed on computers, especially netbooks or Windows Tablets, through system integrators or computer manufacturers using OEM licenses.
Windows 7 Home Basic
Windows 7 Home Basic was available in “emerging markets”, in 141 different countries. Some Windows Aero options are excluded along with several new features. This edition is available in a 64-bit version and supports up to 8GB of RAM. Home Basic, along with other editions sold in emerging markets, include geographical activation restriction, which requires users to activate Windows within a certain region or country.
Windows 7 Home Premium
This edition contains features aimed at the home market segment, such as Windows Media Center, Windows Aero, and multi-touch support. It was available in both 32-bit and 64-bit versions.
Windows 7 Professional
This edition is targeted towards enthusiasts, small-business users, and schools. It includes all the features of Windows 7 Home Premium and adds the ability to participate in a Windows Server domain.
Additional features include support for up to 192 GB of random-access memory (increased from 16 GB), operating as a Remote Desktop server, location aware printing, backup to a network location, Encrypting File System, Presentation Mode, Software Restriction Policies (but not the extra management features of AppLocker) and Windows XP Mode. It, too, was available in both 32-bit and 64-bit versions.
Windows 7 Enterprise
This edition targeted the enterprise segment of the market and was sold through volume licensing to companies which have a Software Assurance contract with Microsoft. 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 is distributed through Microsoft Software Assurance (SA). As a result, it includes several SA-only benefits, including a license allowing the operating of diskless nodes (diskless PCs) and activation via VLK.
Windows 7 Ultimate
Windows 7 Ultimate contains the same features as Windows 7 Enterprise, but unlike the Enterprise edition, it was available to home users on an individual license basis. Windows 7 Home Premium and Windows 7 Professional users are able to upgrade to Windows 7 Ultimate for a fee using Windows Anytime Upgrade if they wish to do so. Unlike Windows Vista Ultimate, the Windows 7 Ultimate edition does not include the Windows Ultimate Extras feature or any exclusive features as Microsoft had stated.