MS05-039 Bozori worm - Rise of the business worm?

The MS05-039 based Bozori worm impacted a number of major businesses yet it didn't impact Internet users as extensively as the Blaster and Sasser worm did in 2003 and 2004 respectively.  This most likely is due to the vulnerability being in W/2000 and the random IP generation design which might make it spread faster on the inside of the network.  Kaspersky in this article discusses the potential for virus writers to target vulnerable businesses who may have difficulty keeping up each month with security patches.  

MS05-039 Bozori worm - Rise of the business worm?

QUOTES: There's no question that this worm is spreading. However, it seems to be confined to localized 'explosions' inside large corporations. These organizations, typically made up of 'small internets' behind heavily defended Internet gateways, have experienced infection.

The Bozori incident suggests that we're on the threshold of a new era, in which 'business worms' will cause 'local network outbreaks' in large corporations, but will have little effect on the Internet as a whole.