Corporate IT departments I've seen always run Antivirus software on their Windows machines, but not on Linux machines, even though there is reason to believe that a virus under Linux is possible:
http://www.cyberciti.biz/tips/debunking-the-linux-is-virus-free-myth.html
Then we have Web Browser hijacking malware and known phishing sites, which some AV packages can proactively warn you about as you inadvertently browse there.
And if you have access to those Corporate AV reports, you'll see people from all areas of the corporation (including experienced software developers) getting infected because of some site they visited or some file they downloaded.
Time will tell if Android becomes the next platform of choice for viruses and malware, after Windows:
SFGate Android Malware article
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