To ensure that your anti-spam services have the most up-to-date data and signatures, you can install and enable the Microsoft ...

To ensure that your anti-spam services have the most up-to-date data and signatures, you can install and enable the Microsoft ForeFront Security for Exchange Server update service.  This enhanced update service automatically checks Microsoft Update daily and downloads new anti-spam data file updates, IP Reputation Service updates, and anti-spam signature updates. Forefront Security for Exchange Server anti-spam update service is a premium feature that requires the Exchange Enterprise Client Access License (CAL) for each user mailbox, if enabled.
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