Windows Server is a brand name for a group of server operating systems released by Microsoft. It includes all Windows operating systems that have "Windows Server" in their names, plus Windows 2000, but not any other Microsoft product.
- Windows Server 2003 (April 2003)
- Windows Server 2003 R2 (December 2005)
- Windows Server 2008 (February 2008)
- Windows Server 2008 R2 (July 2009)
- Windows Server 2012 (August 2012)
- Windows Server 2012 R2 (October 2013)
- Windows Server 10 (Preview) 
Microsoft has also produced Windows Server Essentials (formerly 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.
- "Windows Server". Microsoft Server and Cloud Platform. Microsoft. Retrieved 26 September 2011.
- "Microsoft Server and Cloud Platform". TechNet. Microsoft. Archived from the original on 8 December 2010. Retrieved 26 September 2011.
- "Announcing availability of Windows Server Technical Preview and System Center Technical Preview". Microsoft Server and Cloud Blog. Microsoft. Retrieved 5 December 2014.
- "Windows Essential Business Server". Microsoft TechNet. Microsoft Corporation. Retrieved 26 September 2011.
- "Windows Small Business Server 2008 Technical FAQ". Microsoft TechNet. Microsoft Corporation. Retrieved 26 September 2011.
- Thurrott, Paul (3 September 2011). "Windows Small Business Server 2011 Essentials". Supersite for Windows. Penton Media, Inc. Retrieved 26 September 2011.
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