@blowdart: Odd for sure. I opened Windows Azure and Channel 9 and logged into both. Then I open bing (still see it is logged in) and click sign out for Microsoft account. Windows Azure and Channel 9 BOTH are now no longer logged in. Yet Bing is still.
1. Clear your cookies
2. Close your browser
3. Open your browser, clear your cookies again to hit any session cookies that might have got abnormally written to disk during the browser close last time
4. Close your browser
5. Open your browser and see if you're still logged in.