Scenario (all W2k3 and Ex 2003) InterOrg Free/Busy Replications configured on each domain (A, B, C, and D) using the InterOrg Replication Tool and how to document as follows: A -> B A -> C A -> D B -> A C -> A D -> A Replication does not work on one: A -> B. Although B->A indicates successfull, I am unable to see any of their Free/Busy schedule. All others indicated successful and no errors in log. Error message is unable to create MAPI session. All permissions are identical on each domain.Service accountand passwords have been verified and tested on all domains. Ping, DNS, and WINS have all been verified on each domain as well. I have read and reread the how to document and followed its steps and I cannot seem to determine root cause to resolve. Does anyone have a recommendation of what to try next? Any and all comments, suggestions, recommendations are greatly appreciated. Thank you, Cheri