hack insurance on NT vs. Unix

[Tim McVeigh]

Just last month, Wurzler Underwriting Managers upped the price
  for insuring companies that use Microsoft's Windows NT server
software, on the basis that the
  software has had a series of security problems. Wurzler, one of the
earliest agencies to offer hacker
  insurance, began charging its clients 5 percent to 15 percent more if
they use Microsoft's Windows NT
  instead of Unix or Linux for their Internet operations.

from
http://dailynews.yahoo.com/h/cn/20010607/tc/insurer_businesses_unaware_of_online_risks_1.html