Trying to work through docs on setting up GW-Exchange coexistence. Read though for the GW docs on how to setup the MTA for the address book synchronization. It talks about the exchange users being stored in a external domain object but it doesn't go over if creating that external domain beforehand. Trying to figure out if that needs to be created beforehand or is it created during the mta setup? If it needs to be created beforehand, does anyone know of any documentation on setting that up beforehand?