The Microsoft Exchange Information Store service crashes on a Microsoft Exchange Server 2007 server when a user tries to access a specific calendar item. Additionally, you find the following error message in the Application log:
Log Name: Application Source: MSExchange Common Event ID: 4999 Description: Watson report about to be sent to dw20.exe for process id: <ID>, with parameters: E12N, c-rtl-AMD64, <version number>, store.exe, EXCHMEM.dll, 49e9, c0000005, <version number>. ErrorReportingEnabled: True
This problem occurs because the specific calendar item includes long MIME properties. When the user tries to access the specific calendar item, an Exchange Collaboration Data Objects (ExCDO) background expansion is triggered which causes a heap corruption.
To resolve this problem, install the following update rollup:
979784 Description of Update Rollup 3 for Exchange Server 2007 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.