Twice a year Microsoft hosts an invite only security briefing on the Redmond campus called “BlueHat”. Access to the event is invite only for non Microsoft employees. Some of the briefings are recorded and made available to the public on the “BlueHat Security Briefings” TechNet page.
Available videos include:
“Behind the Curtain of Second Tuesdays: Challenges in Software Security Response”
“Nine Trends Affecting the Future of Exploitation”
“Browser Hacks, Design Flaws, & Opt-In Security”
“Cyber [Crime/War] – Connecting the Dots”