Big business, this spam thing. Google has just announced a $625m plan to buy Postini (more here). The deal is an outright cash purchase to be completed by end Q3 2007.
Postini is best know for its corporate spam filtering solution, but it is also active in the areas of instant messaging, compliance and mail archiving. These neatly complement Google's application rangen (especially for products like Gmail/Google Mail). It will also mean that Google will acquire some large Blue Chip corporations that have so far been outside its reach.