Microsoft has submitted open-source code under the GPLv3 to Samba...Yes,
you have to believe that Microsoft has really submitted code to the Samba
file server open-source project.Samba is used to seamlessly integrate
Linux/Unix servers and desktops into Active Directory (AD) networks using
the Winbind daemon. Samba is on almost every network attached storage (NAS)
device that ships today. In short, Samba enables Linux to rival Windows
Server on workgroups. Samba enables Linux to deliver the bread and butter
of file and print serving that every business needs in millions of
companies.
http://www.efytimes.com/e1/72557/fullnews.htm