Hi, Please verify if you can manually start the service. Please verify if you have anti-virus application install together with Exchange Server. If not, please try to run ExBPA to have a health check of the current Exchange organization and then post the result here. Please clarify if you have changed account which is used to logon the services. Please check event log and then post the related error event here. Besides, please apply the latest update for your Exchange Server. The Microsoft Exchange RPC Client Access service crashes intermittently on an Exchange Server 2010 server http://support.microsoft.com/kb/2536517Xiu Zhang TechNet Community Support

Hi, Please verify if you can manually start the service. Please verify if you have anti-virus application install together with Exchange Server. If not, please try to run ExBPA to have a health check of the current Exchange organization and then post the result here. Please clarify if you have changed account which is used to logon the services. Please check event log and then post the related error event here. Besides, please apply the latest update for your Exchange Server. The Microsoft Exchange RPC Client Access service crashes intermittently on an Exchange Server 2010 server http://support.microsoft.com/kb/2536517Xiu Zhang TechNet Community Support