there seems to be a serious issue with many installs of Exchange 2013 were the RPC Client Access Service is crashing sporadically. System Event ID shows:
The Microsoft Exchange RPC Client Access service terminated unexpectedly. It has done this 1 time(s). The following corrective action will be taken in 5000 milliseconds: Restart the service.
This stops Outlook clients connecting and mail being delivered.
There are also multiple ASP.net errors in the Application logs.
Has anyone seen this or managed to get a fix?