CRM Email Router Manager Service is Stopped.

dears,

i was faced this problem a few months ago, the email router service is stoped and when i restart it never start and receive error "The Microsoft CRM Email Router service on Local Computer started and then stopped. Some services stop automatically if they have no work to do" 

So after research i recognize that the error related to email router state, it's stucked. after i see the event log i see this:

The E-mail router service cannot access system state file Microsoft.Crm.Tools.EmailAgent.SystemState.xml.

so after that i delete this file and restart the email router service and it's worked fine.

good luck.