Every 10-15 minutes I receive a Warning: Event Type: Warning Event Source: MSExchangeIS Event Category: Virus Scanning Event ID: 9874 Date: 16.04.2008 Time: 15:44:45 User: N/A Computer: --- Description: Unexpected error 0x8004010f occurred in "EcProcessVirusScanQueueItem" during virus scanning. Mailbox Database: /ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=---/cn=Microsoft Private MDB Folder ID: f-1481D2C Message ID: 1-2A9CA36B Everything if fine when i disable XMON. Error 0x8004010f means "not found". So as far I can tell, something deletes an item before "EcProcessVirusScanQueueItem" tries to scan a message. The strange thing is that NOD LOGs don't show any caught viruses. We're running Exchange 2007 Enterprise Edition without Forefront.