Subsystem for UNIX-based Applications is a POSIX compatibility layer for Windows that is found in some versions of Windows Server and in the Enterprise and Ultimate editions of Windows Vista and 7.
The Subsystem for UNIX-based Applications (commonly known as SUA) is a POSIX compatibility layer for Microsoft Windows. It superseded Services for UNIX (SFU), a standalone package.
SUA is available in the following Windows products:
- Windows Server 2003 R2
- Windows Server 2008 R2
- Windows Server 2012
- Windows Vista Enterprise
- Windows Vista Ultimate
- Windows 7 Enterprise
- Windows 7 Ultimate
- Windows 8 Enterprise
Starting with Vista, the utilities and SDK formerly included in SFU are a separate download on the Microsoft website.
Microsoft has deprecated SUA in Windows 8, and it will be removed in Windows 8.1.
