Background scanning on engine update
Applies to: Forefront Security for Exchange Server
Background scanning on engine update is intended to ensure that all files are scanned using the latest updates and configurations. Background scanning initiates a scan of the entire information store after scan engine updates.
Background scanning on engine update is disabled by default upon installation because background scanning of large information stores can place a heavy load on the server. For information about enabling background scanning on engine update, see the Background Scanning and On-Access Scanning chapter of the "Microsoft Forefront Security for Exchange Server User Guide."