Even more for the Patterns & Practices folks
Security Guidance Index:
https://msdn.microsoft.com/library/en-us/dnpag2/html/SecurityGuidanceIndex.asp
Security Engineering Index:
https://msdn.microsoft.com/library/en-us/dnpag2/html/SecurityEngIndex.asp
Security How Tos Index:
https://msdn.microsoft.com/library/en-us/dnpag2/html/SecurityHowTosIndex.asp
Security Practices for ASP.NET:
https://msdn.microsoft.com/library/en-us/dnpag2/html/PAGPractices0001.asp