I've recently applied RU6 for all my components for CRM 2011 and all returned fine and have been able to apply Further RU's to all components except mail router. Each roll up I apply to this component returns an error saying that KB 2600640 isn't installed on the system.
I have reinstalled this component of the RU again with no errors being returned, but still not able to apply any further rollups.
Any Advice appreciated.
Jock