Microsoft Servers

Microsoft Servers (previously called Windows Server System) is a brand that encompasses Microsoft's server products. This includes the Windows Server editions of the Microsoft Windows operating system itself, as well as products targeted at the wider business market. Unlike Microsoft Dynamics or Microsoft Office product lines, most of the products sold under this brand are not intended to be line-of-business services in and of themselves.

The Microsoft Servers line of software and technology includes:

Initially, Microsoft server operating systems were editions of Windows NT family. Starting in 2003, a Windows Server subfamily was formed that encompasses server operating system versions independent of the client versions of Windows.

Server operating systems of Microsoft include:

The following are special offerings consisting of one of the operating systems above:

Some of the products included in the Windows Server System product branding are designed specifically for interaction with Microsoft Office. These include:

Microsoft System Center, a set of server products, aims specifically at helping corporate system administrators manage a network of Windows Server and client desktop systems.

...
Wikipedia