This story in TidBits didn't get much of a mention on the list Was it an April Fools joke
John

 Although 1999 seems an eternity ago, some things never change,
  and today the U.S. Department of Homeland Security (DHS) announced
  that it would be standardizing all of its computing functions on
  Macs running Mac OS X. As with the Army's decision back in 1999,
  the reason is security. Even though Microsoft continues to block
  holes in Windows, we've seen an ever-increasing number of worm and
  virus epidemics that have turned millions of Windows-based PCs
  into zombie spam generators and resulted in many billions of
  dollars of damage and cleanup costs.

  Therein lies the difference since 1999. Although DHS remains
  concerned about the security of its internal and external Web
  sites, the real worry today is that the entire department could
  be crippled by a virulent Windows worm or virus. The Army was
  merely embarrassed by their Web site being modified, but a worm-
  based attack on DHS computers could seriously compromise the
  agency's ability to respond to a terrorist attack. DHS has been
  particularly concerned about such attacks, issuing an alert in
  March about a Windows program called Phatbot that brings peer-
  to-peer networking concepts to malicious software.



  Needless to say, the announcement is good news for Apple Computer,
  since it will entail the purchase of hundreds of thousands of
  Macintosh systems. Apple stock rose $4.01 on the announcement
  as Wall Street took account of the future earnings.

  It's important to remain realistic about the effects of DHS
  switching to Mac OS X. In the past, Macs have been largely free of
  worms and viruses at least in part because Macs weren't generally
  used in "interesting" places (interesting, that is, to the sort of
  people who write malicious software). Targets don't get much more
  prominent than DHS, and I fully expect to see more hacking effort
  aimed against Macs in the near future. Apple is not unaware of
  this possibility either, and has already started advertising for
  additional security engineers, as evidenced by the job posting
  below (Apple ID required for login).