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POSIX and OS/2 are not supported in Windows XP or in Windows Server 2003

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article was previously published under Q308259
INTRODUCTION
There is no support for POSIX or OS/2 programs in Microsoft Windows XP-based or in Microsoft Windows Server 2003-based operating systems.
MORE INFORMATION

POSIX support

The Portable Operating System for UNIX (POSIX) subsystem is not included with Windows XP or with Windows Server 2003. The POSIX subsystem has been replaced with a more UNIX-like environment that is named Windows Services for UNIX. Windows Services for UNIX is a superset of the original POSIX subsystem and provides greater functionality for UNIX programs. Windows Services for UNIX requires Windows XP Professional Service Pack 1 (SP1) or later.

For additional information about Windows Services for UNIX, visit the following Microsoft Web site:

OS/2 support

The OS/2 subsystem is not included with Windows XP or with Windows Server 2003. An alternative solution for OS/2 programs is Microsoft Virtual PC 2004. Virtual PC 2004 supports most OS/2 programs including OS/2 programs that have a graphical user interface (GUI).

For more information about Virtual PC, visit the following Microsoft Web site:
Properties

Article ID: 308259 - Last Review: 11/05/2007 05:39:03 - Revision: 2.9

  • Microsoft Virtual PC 2004
  • Microsoft Windows Services for UNIX 3.5
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Professional SP1
  • Microsoft Windows Server 2003, 64-Bit Datacenter Edition
  • Microsoft Windows Server 2003, Enterprise x64 Edition
  • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
  • Microsoft Windows Server 2003, Web Edition
  • kbenv kbinfo KB308259
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