After you install Update Rollup 2 for Microsoft Exchange Server 2007 Service Pack 3 (SP3) on a computer, the EdgeTransport.exe process on the server crashes occasionally. Additionally, the following event is logged in the Application log:
This issue occurs because Exrpc32.dll does not verify a NULL buffer before it accesses the buffer when the message is delivered. Therefore, an access violation occurs in the EdgeTransport.exe process.
To resolve this issue, install the following update rollup:
2602324 Description of Update Rollup 5 for Exchange Server 2007 Service Pack 3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.