Steve Gibson (of SpinRite fame) proposed a theory in his weekly Thursday-night
podcast
last week that if true, would be the biggest scandal to ever hit
Microsoft - that the Windows Metafile (WMF) vulnerability that drew so
much media attention last month is actually
a backdoor programmed
intentionally by Microsoft for unknown reasons.
http://www.sysinternals.com/blog/2006/01/inside-wmf-backdoor.html