Microsoft to Release Internal Security Tools

[HaZ]

Microsoft began to take security of their operating systems and applications around 2001 when coding problems in many of its products left open doors to a whole wave of malicious programs.

Microsoft to Release Internal Security Tools : Read more

 

[jhansonxi]

There have been other tools released over the years like the Microsoft Baseline Security Analyzer:
http://technet.microsoft.com/en-us/security/cc184924.aspx