Adding “exchangedelegation.domain.com” to Federation Trust via “Manage Federation” wizard throws the error: “Unable to reserve domain "FYDIBOHF25SPDLT.exchangedelegation…” in Exchange Server 2010 SP2
Problem You would like to set up your Exchange 2010 with SP2 organization to federate with other domains so you go through the steps required by setting up one-time federation with Microsoft Federated Gateway, create