We have an installation of Exchange 2013 CU2 in place at a customer site. Operating system is Server 2012 standard.
They regularly use the delivery report from the ECP. When they either run a search, or when the click on a message from the search results the commonly get and error which simply states "Specified Cast Is Not Valid"
This is server is still co-existing with an Exchange 2007 that is not quite ready to be removed for extenuating circumstance.
Any thoughts on what can be done to remedy this?