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.
Thanks.
GTKINCAsked:
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aissimCommented:
I agree, MS network monitor (current version) is much better than it used to be. Download: http://www.microsoft.com/downloads/details.aspx?familyid=18b1d59d-f4d8-4213-8d17-2f6dde7d7aac&displaylang=en

Ethereal is another popular one: http://www.ethereal.com/download.html
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65tdRetiredCommented:
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.

http://support.microsoft.com/kb/812953
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65tdRetiredCommented:
As posted above MS has released a new version (3.1) of it's network monitoring software, which has a easier to use interface.

http://www.microsoft.com/downloads/details.aspx?FamilyID=18b1d59d-f4d8-4213-8d17-2f6dde7d7aac&DisplayLang=en
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