Exchange Mailbox Scan

Does anyone know if there is a service available where we can run a one time scan on our exchange mailbox enviroment? I would like to rule out that none of our mailboxes have been infected with a virus. The time will come where we will purchase a agent that will do this for us on an ongoing basis such as TrendMicro ScanMail, but for now Im looking for a short term objective.
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Most Trend Micro products are availablefor trial use. So I recommend taking advantage of their offer.

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Also you can later convert the trial to a full license without having to remove and re-install if you can convince them to purchase the product in the near future.
Check Microsoft Solution "Forefront Protection 2010 for Exchange Server"
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