On a computer that is running Microsoft Exchange Server 2010, the Exchange RPC Client Access service crashes. When this situation occurs, you find the following error is logged in the Application log.
Source: MSExchange Common Event ID: 4999 Task Category: General Level: Error Description: Watson report about to be sent for process id: <process ID>, with parameters: E12, <build type>, <application Version>, RpcClientAccess, M.Exchange.RpcClientAccess.Handler, M.E.R.H.RecipientTranslator.GetRecipientRow, System.NotSupportedException, <callstackHash>, <assembly Version>
Exchange Server 2010 checks the codepage property of the message to determine the encoding that is used for non-Unicode properties of the recipient. If the codepage property has invalid values, the Exchange RPC Client Access service crashes. .
To resolve this problem, install the following update rollup:
976573 Description of Update Rollup 1 for Exchange Server 2010