When you send an email message in a Microsoft Exchange Server 2010 Service Pack 1 (SP1) environment, the Store.exe process might crash if the email message has some attachments. Additionally, the following event is logged in the Application log in this situation:
Log Name: Application
Source: MSExchange Common
Event ID: 4999
Task Category: General
Watson report about to be sent for process id: Process ID, with parameters: E12N, Build Type, Version Number, store.exe, store.exe, XXXX, c0000005, XXXX, Version Number. ErrorReportingEnabled: True
This issue occurs because a property of the email message is set incorrectly.
This causes the Store.exe process crash when it handles the attachments in the email message.
To resolve this issue, install the following update rollup package:
2608646 Description of Update Rollup 6 for Exchange Server 2010 Service Pack 1
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.