X500 addresses should've been migrated as part of the ADC replication so that replies work. If the migrated mailbox does not have an x500 address, then users still on 5.5 will get bounce backs when replying to that user. To correct this, the sender would have re-choose the recipients name in the GAL, or delete the nickname cache in outlook. You need to verify that x500 addresses are being replicated over. Inter-Organizational Connection Agreements and Two-Way Replication Although inter-organizational connection agreements can only be configured to replicate in one direction, you can achieve coexistence by configuring two one-way inter-organizational connection agreements between the Exchange Server 5.5 server and Active Directory. Setting up two one-way ADC inter-organizational connection agreements that point in opposite directions enables the inter-organizational ADC to replicate the Exchange Server 5.5 directory information to Active Directory and to stamp replicated objects with the X500 address of the Exchange Server 5.5 mailbox. If you use the inter-organizational Active Directory Connector for directory synchronization during coexistence, do so only during the migration process. Note When you establish two one-way inter-organizational connection agreements, ensure that the target container of one connection agreement is not the source container of the second connection agreement. X500 Addresses The Exchange Server 5.5 migration process uses X500 addresses in two different ways: * To ensure reply functionality for e-mails that are sent to a mailbox owner after migration. * As a search criterion when looking for Active Directory user objects that have already been created for mailboxes selected for migration. Ensure that the connection agreement includes X500 addresses with replicated objects. http://www.microsoft.com/technet/prodtechnol/exchange/2003/insider/migra tion-wizard-part1.mspx ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Darin Sullivan Sent: Friday, March 24, 2006 11:13 AM To: ExchangeList Subject: [ExchangeList] 5.5 to 2003 Migration http://www.msexchange.org ------------------------------------------------------- I have a large migration project that involves migrating a NT 4.0 Domain with Exchange 5.5 to a Windows 2003 Forest with Exchange 2003 that are in Native Mode. There must be co-existance between the two during the migration and the users that get migrated over must keep the same smtp address. I have a test environment and I am using ADMT to migrate objects over and perform security translation, along with using the exchange migration tools to bring the mailbox over. I also have ADC configured with two Inter-Org connections configured as described in Microsoft Documentation. I think I am missing a piece somewhere as I don't understand how mailflow occurs between users that have been migrated over to the Exchange 2003 server. Once a user gets migrated, the other users gets a bounce back when they try to email that person. From reading, it should be using x.500 to deliver the email? Am I trying to do something that's not supported? Darin Sullivan Consultant Keller Schroeder & Associates, Inc. 812-474-6825 mailto:dsullivan@xxxxxxxxxx www.KSAinc.com ------------------------------------------------------- List Archives: //www.freelists.org/archives/exchangelist/ MSExchange Newsletter: http://www.msexchange.org/pages/newsletter.asp MSExchange Articles and Tutorials: http://www.msexchange.org/articles_tutorials/ MSExchange Blogs: http://blogs.msexchange.org/ ------------------------------------------------------- Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------- To unsubscribe visit http://www.msexchange.org/pages/exchangelist.asp Report abuse to listadmin@xxxxxxxxxxxxxx