Exchange Server 2013 introduces a new feature called Managed Availability, which is a built-in monitoring system with self-recovery capabilities.
If you’re not familiar with Managed Availability, it’s a good idea to read these posts:
- Lessons from the Datacenter: Managed Availability
- What Did Managed Availability Just Do To This Service?
As described in the above posts, Managed Availability performs continuous probing to detect possible problems with Exchange components or their dependencies, and it performs recovery actions to make sure the end user experience is not impacted due to a problem with any of these components.
Read more at source: http://blogs.technet.com/b/exchange/archive/2013/08/13/customizing-managed-availability.aspx