As title shows, Free/busy fails from Exchange 2007 to 2010
Scenario is two forests, exchange 2007 in one, Exchange 2010 in other. No trust, but GAL sharing is set up.
Works from 2010-2007 but not the other way round. Error is "no information"
Error appears in CAS Server below:
Process Microsoft.Exchange.InfoWorker.Common.Delayed`1[System.String]: <User>SMTP:user@domain.com failed. Exception returned is Microsoft.Exchange.InfoWorker.Common.Availability.E14orHigherProxyServerNotFound: No Client Access server of at least version <User>SMTP:user@domain.com was found to process the free/ busy request for recipient 1937801216.
Name of the server where exception originated: SERVER. This event may occur when Availability Service cannot discover an Availability Service in the remote forest.
Any ideas?