"The Security Vulnerability Research and Defense blog, introduced Thursday, provides in-depth technical information and ways security professionals can protect an organization from vulnerabilities. The blog will be updated the second Tuesday of every month, called "Patch Tuesday," which is when Microsoft releases security updates for Windows and other software.
"During our vulnerability research, we discover a lot of interesting technical information," Microsoft said in the first posting. "We’re going to share as much of that information as possible here because we believe that helping you understand vulnerabilities, workarounds, and mitigations will help you more effectively secure your organization."
During technical investigations of security issues, information is discovered that doesn’t make it in the official security updates, but is important to share, the company said." Microsoft Opens Up On Security Research — Microsoft — InformationWeek