The Microsoft Exchange System Attendant service crashes intermittently in the Oabgen.dll module on an Exchange Server 2007 server

The Microsoft Exchange System Attendant service (Mad.exe) crashes intermittently in the Oabgen.dll module on a Microsoft Exchange Server 2007 server. Additionally, the following events are generated in the Application logs:

Event ID: 4999
Event Type: Error
Event Source: MSExchange Common
Description:

Watson report about to be sent to dw20.exe for process id: 6120, with parameters: E12N, c-rtl-AMD64, 08.01.0393.001, mad.exe, OABGEN.DLL, 32fb7, c0000005, 4aab, 08.01.0393.001. ErrorReportingEnabled: False

Event ID: 1000
Event Type: Error
Event Source: Application Error
Description:

Faulting application mad.exe, version <version number> ,time stamp <stamp> , faulting module OABGEN.DLL, version <version number>, time stamp <stamp>, exception code 0xc0000005, fault offset <address>,

process id <ID>, application start time <xxxxxxxx> .

This problem occurs because of an antivirus application that scans the public folders. The application scans the Offline Address Book (OAB) messages in the public folder store and removes the OAB attachments. This causes exceptions in the OAB generation process. Therefore, the Mad.exe process crashes.

To resolve this problem, install the following update rollup:

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.