Possible Duplicate:
Automatically protect questions with three or more low-rep-user deleted answers
Why wasn't this question automatically protected after 7 deleted spam answers?
This question here:
Is there any way to change the Windows 7 password using the command prompt?
It should have been auto-protected, since there are already three deleted spam answers on it. Now, I believe two of those were even carried over from Stack Overflow, which is what triggers the bug — they don't count as being deleted on Super User.
In any case, the auto-protecting of migrated questions has always seemed buggy to me, and this is at least one example of that.
