We are using Outlook 2010 for emails connected to Exchange Server 2010 SP2 RU1 We received as below alert while I am not unable to connected to exchange from outlook Log Name: Application Source: MSExchange Common Event ID: 4999 Level Error: Details: The description for Event ID 4999 from source MSExchange Common cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer. If the event originated on another computer, the display information had to be saved with the event. The following information was included with the event: 3396 E12 c-RTL-AMD64 14.02.0283.003 M.E.RpcClientAccess.Service M.Exchange.StoreProvider M.M.MapiMessage.SetReadFlag M.Mapi.MapiExceptionNetworkError-24526 5bb8-8deb 14.02.0283.003 False Can Someone please tell me whats this error means and why did it happen? -- Regards Ahsan Kamal | MCITP

This doesn't say much, it's basically saying it can't interpret the event collection because possibly some bin files are missing. So we don't know whats generating the fault. What is the issue you're seeing? You can't connect to exchange at all or sometimes? Did you reboot? All services are started? Go ahead and start with installing RU3. Also run exbpa and post the diagnostics.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

The problem is that all users are connected to the exchange server but couldn't send or received any email from/to any internal and external domains. Usually users are connected to the main site but what I saw that all database were mounted on another site DAG server, so I moved all databases to main site DAG server and the problem was solved but didn't find any clew on that issue. Can you please suggest me how I can find this issue why this happened and what is the possibility to fix this issue to avoid downtime in future?-- Regards Ahsan Kamal | MCITP

It appears the issue is because that Exchange server did not update. See http://social.technet.microsoft.com/Forums/eu/exchange2010/thread/0c6f7700-58a6-498b-9d77-56f05cb283c2 http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/ae5581c9-8cf8-43df-bceb-ab05940c4038/Fiona Liao TechNet Community Support

Hi Ahsan, Please see below KB articles. http://support.microsoft.com/kb/980852 http://support.microsoft.com/kb/2600835 Thanks, Damitha

I already running Exchange Server 2010 SP2 RU1.-- Regards Ahsan Kamal | MCITP