One of our architects had planned a design based on the Active Directory Connector (ADC) using one-way connection agreements (from Exchange 5.5 to Active Directory). Although this is simple in terms of the number of connection agreements we need, I have concerns, since the recommended approach is to configure two-way connection agreements.
What are the critical issues, if any, with one-way connection agreements regarding a migration that is as involved as ours?
I think there might me a lot of additional detail that isn't being included in the question posted to the forum. One-way connection agreements will definitely protect your production source environment in the event something happens to the target. So, it could be that one-way connection agreements were decided on because the ability to control and manage the new target environment was unknown. Also, one-way connection agreements most likely simplified the overall structure of the migration prep and planning work to configure the ADC for use in the environment.
Is there some downside? Sure. Changes from Active Directory will not be reflected in objects that still primarily exist in Exchange 5.5.
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We performed a similar migration last summer. You may want a two-way or two one-way agreements per site (the former is not recommended by Microsoft, but we did it that way for more control) to update your Exchange 5.5 side to reflect the new homeserver/mailbox information of the migrated user and modifications -- additions made to the Exchange 2003 side. Otherwise, the Exchange 5.5 user gets "account does not exist in the organization" when sending to an Exchange 2003 user. You can also check off the "do not delete" button on the connector to prevent accidental deletions on the Exchange 5.5 side.
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