Daring Fireball: " The Exchange/Outlook platform is quite simply a menace not only to the organizations that use it, but to the world at large. People who do not use Outlook, who have never used it, are forced to deal with tens of thousands of Sobig-infested messages flowing into their mail spools.
That's scandalous. Microsoft bears responsibility, but so too does every single organization whose computers were afflicted. To respond to this by sticking with Exchange/Outlook is outrageous. I mean, what are the odds that this will happen again? I'd say they approach 100 percent. Truly, a matter of when, not if. "