Original mail is archived at https://lists.samba.org/archive/samba-technical/2011-October/079780.html.
Samba, the open source implementation of SMB/CIFS protocol, is the de-facto infrastructure piece in any mixed Linux-Windows environment. Samba is a clean room implementation in which most (if not all) technical details were obtained by observing the communication between different Windows machine, and not by having protocol specification at hand nor any proprietary code. In fact, the protocol wasn't available until 2007 due to Microsoft vs European Commission antitrust case.
That is to say a patch submission from coders at Microsoft would have been amazing to the point of unthinkable (Chris Hertel of Samba team).
However, that changed as of October 10th, 2011 when Microsoft Open Source Technology Center contributed a proof of concept for extended protection (channel and service binding) for Firefox and Samba (Stephen Zarkos of MS OSTC). That is certainly a big deal (Jeremy Allison of Samba). Hooray!
This news was reported in ZDnet on November 2nd.