http://blogs.techrepublic.com.com/10...73&tag=nl.e101

Grand total

Daren Lewis of Symantec keeps tabs on many of the botnets for MessageLabs and has come up with some startling numbers. Here are the overall statistics:

* 80 percent of all spam is sent by these 10 botnets.
* These 10 botnets send 135 billion spam messages a day.
* Five million computers belong to the 10 botnets.
Is your PC infected? Do you have an up to date antivirus?