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