Security Update (KB939778). The GNU Project utilities are several versions older than the latest ones. A separate port of the up-to-date Debian utilities was started in 2007, but apparently abandoned in 2009. Several of the text processing utilities in SUA (e.g. awk) are not compatible with Unicode or wide character text files. No version of Windows Services for UNIX is available for Windows XP Professional x64 Edition. Legacy Windows Server 2003 R2 contains most SFU components, namely Microsoft Services for Network File System (NFS), Subsystem for UNIX-based Applications (SUA, a.k.a. Interix), and Identity Management for UNIX. The July 2007 SFU 3.5 Security Update updated posix.exe and related files to match the SUA version. Unlike the SFU, the SUA version included in Windows Server 2003 R2 (and subsequent versions) has 64-bit support and allows linking of Win32 libraries to SUA applications. Windows Vista and Windows 7 Enterprise and Ultimate Editions also contain the Services for Unix components, now called the Subsystem for UNIX-based applications (SUA), and Client for NFS v3. Users must download the utilities and SDK separately. However, the server components from the SFU product line (namely Server for NFS, User Name Mapping, Server for NIS, Password Synchronization etc.) are not included – these are included in Server editions of Windows (i.e. Windows Server 2008). SUA was deprecated in Windows 8 Enterprise and Windows Server 2012, and completely removed in Windows 8.1 and Windows Server 2012 R2. The NFS server is still supported in Windows Server 2012 R2. The NFS client feature and server features are separate from the SUA in Windows 7 and 2008, and remained supported until Windows Subsystem for Linux replaced it. On desktop (Windows 7), NFS is only available in the Enterprise and Ultimate editions. The free reference implementation of NFS 4.1 for Windows (by UMICH CITI), the development of which was sponsored by Microsoft, does work on lower-end versions of Windows 7, but requires more involved installation. In Windows 8, the NFS client gained krb5p (Kerberos 5 with full data encryption) support. In Windows 7, Kerberos 5 was supported for authentication, but only packet integrity checking was available for data. The maximum block/buffer size was also increased from 32 KB to 1 MB in Windows 8. Windows Server 2012 added support for NFS 4.1 server. The new implementation is kernel-based (RPC/XDR-wise) but many optional features from NFS4 are not implemented, including ACLs, pNFS etc. There