I've just started getting an Event ID 4999 error in my Application logs within the last couple of days. It relates to MSExchange Common; we're not experiencing any usability issues with Exchange. Has anyone seen this error before? Log Name: Application Source: MSExchange Common Event ID: 4999 Task Category: General Level: Error Keywords: Classic User: N/A Computer: (server name) Description: Watson report about to be sent to dw20.exe for process id: 7328, with parameters: E12IIS, c-RTL-AMD64, 08.01.0240.006, WS, unknown, M.E.D.C.L.S.IFormattable.ToString, System.NotSupportedException, e88d, unknown. ErrorReportingEnabled: False Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange Common" /> <EventID Qualifiers="16388">4999</EventID> <Level>2</Level> <Task>1</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2012-04-30T16:25:28.000Z" /> <EventRecordID>950203</EventRecordID> <Channel>Application</Channel> <Computer>(server name)</Computer> <Security /> </System> <EventData> <Data>7328</Data> <Data>E12IIS</Data> <Data>c-RTL-AMD64</Data> <Data>08.01.0240.006</Data> <Data>WS</Data> <Data>unknown</Data> <Data>M.E.D.C.L.S.IFormattable.ToString</Data> <Data>System.NotSupportedException</Data> <Data>e88d</Data> <Data>unknown</Data> <Data>False</Data> </EventData> </Event>

What version of Exchange? This seems to indicate a bug with a particular roll up. Make sure you're in the latest Exchange SP and rollup.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

I was thinking it could be a bug Running Exchange Server 2007 version 08.01.0436.000

Yeah you are way behind. Install the SP3, reboot then install RU 7. It could be a bug or compatibility with third party apps since you are behind, you may have updated your third party apps and they conflict... Description of Update Rollup 7 for Exchange Server 2007 Service Pack 3 http://support.microsoft.com/kb/2655203James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Hi BadBoyHouse, Any updates? Have you installed the Exchange 2007 SP3 RU7? Frank Wang TechNet Community Support

I'll let you know. Will install within the next few days. Thanks

Hi BadBoyHouse, Any updates now?Frank Wang TechNet Community Support

since last Tuesday, the error hasn't appeared in the logs again. Weird. Will still get the update on though.