One of the goals of the bug counting report is to demonstrate that Microsoft fixed fewer bugs for IE than Mozilla did for Firefox. Unfortunately for Microsoft (and for anyone trying to use this report as analysis of useful metrics) he does not count all the security issues. If he were able to count them all, Microsoft could get credit for all the bugs they fixed. He counts only the public issues, because that is all Microsoft will tell us about. Microsoft is worried that if it ever says it has fixed X security issues, the world will focus on that it had X vulnerabilities in the first place, not that they are now fixed and no longer a risk for users. So the set of issues that are available for public comparison is limited to the set of vulnerabilities that are reported externally AND fixed in security updates.

At Mozilla.

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