Network monitoring software.

Im suspecting that one or more computers on my network, are infected with a virus and are sending out emails. Is there a good way to verify that? Like a network monitor program or something.
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I agree, MS network monitor (current version) is much better than it used to be. Download:

Ethereal is another popular one:
Windows has a build in program called network monitor, installed from add/remove programs, windows components, monitoring.

Takes a little getting use to, plenty of info at the MS site on reading the captures though.
As posted above MS has released a new version (3.1) of it's network monitoring software, which has a easier to use interface.
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