Running exchange 2013 cu2 and exchange 2010 sp3 in mixed mode. external dns pointing to 2013 server, and OWA is redirecting to users still on exchange 2010. Woking fine. But if a 2010 mailbox want to set Out of Office nothing happens. Seems like Owa to owa redirection is working but not to ecp.
Anyone knows what to do?
Regards
LS