Hello everybody There are up to 4 different Exchange 2003 organizations. Each Exchange Org would like to share free/busy information with each other Exchange Org. According to http://www.msexchange.org/tutorials/FreeBusy-Folders-Exchange-Server-2003-Depth.html I can do that with the Interorg replication tool. How would be the topology? Every organization is replicating to each other, or is there a master to whom the other 3 organizations are replicating to, and the master replicates back to the other 3 Organizations? What about GALSync. The same article describes that directory synchronization is possible as well. So I don’t need Identity Integration Feature Pack? I am a bit confused, can anyone please bring light to my darkness? Thanks a lot and regards Peter

Hi, Based on your description, I understand that you would like to share the free/busy information among your four exchange organizations. So you are in a mesh configuration, you should open three sessions to the other three organizations for each organization. And here is more information about GAL Sync and Inter-Organization replication. Planning to Deploy Exchange in a Multiple Forest Environment: http://technet.microsoft.com/en-us/library/bb124677(EXCHG.65).aspx Best regards, SerenaPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.