For example, Microsoft software available through volume-licensing programs includes Windows Vista, Windows 7 Enterprise, Windows 8 Enterprise, Windows Server 2008, Microsoft Office 2007 and many others.
Windows 8.1 is primarily available as a free download through Windows Store for users of retail or OEM copies of Windows 8, Windows 8 Pro, and Windows RT.
In Windows 8, the function was renamed Add features to Windows 8; it allows users to upgrade between the two consumer-oriented Windows 8 editions, and add Windows Media Center to their installation.
Out-of-box sideloading support is only available for Windows 8 Enterprise computers that have joined a Windows domain.
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