When you try to start the MS CRM E-mail Router Service in Microsoft Dynamics CRM Backend Server, you get an error like

The Microsoft CRM Email Router service on Local Computer started and then stopped. Some services stop automatically if they are not in use by other services or programs.

 

This problem occurs because the Microsoft.Crm.Tools.EmailAgent.SystemState.xml file is corrupted.

1. Delete the Microsoft.Crm.Tools.EmailAgent.SystemState.xml file.
   

   C:\Program Files\Microsoft CRM Email\Service\Microsoft.Crm.Tools.EmailAgent.SystemState.xml

2. Restart the Microsoft Dynamics CRM E-mail Router Service.

 

More info : https://support.microsoft.com/en-us/kb/954522

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