I'm trying to add Exchange 2010 calendar overlay to SharePoint 2013. Everything is fine if i'm doing the same with Exchange 2010 and SharePoint 2010 versions. I can see my Exchange events on SP2010 calendar. But it fails on SP2013. All I get is this error: Unable to access an account or mailbox.
I've managed trust in SP and both SP2010 and SP2013 servers are in the same domain. The problem is somewhere else.