Samba is an Open Source application that provides an SMB implementation for POSIX-compatible operating systems. Providing support for a Windows-based file-sharing protocol on POSIX servers sometimes requires mapping Windows semantics to POSIX semantics. Samba has always been catching up with Microsoft. Here is a list of Samba releases and what they support (or will support). Full CORE and Workgroup support. Somewhat basic NT4-style support. Full CORE and Workgroup support. Almost complete NT4-style support. FIXME Full CORE, Workgroup, NT4 and ADS support.