Windows Server is a brand name for a group of server operating systems released by Microsoft Corporation. All are part of Microsoft Servers.
This brand includes the following operating systems:
Microsoft has also produced Windows Small Business Server and Windows Essential Business Server (discontinued), software bundles which includes a Windows Server operating system and some other Microsoft Servers products.
Other server operating systems 
The following operating systems are not part of Windows Server family but are designed for operating on server computers.
- Windows Home Server, a home server operating system for file sharing and streaming, automated backups, and remote access
- Windows MultiPoint Server, an operating system for computers having multiple simultaneous local users.
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