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How to convert from mixed mode to native mode in a Microsoft Exchange organization when working with a Cisco Unity server
As long as Cisco Unity is already talking or pointing to Exchange 2000 as supported in mixed mode, and all the mailboxes are already in Exchange 2000, there should be no issues with Exchange in native or non-native mode.
Before you can change an organization from mixed mode to native mode, make sure these situations apply:
There are no Exchange 5.5-based servers in your organization.
There are no plans to add Exchange Server 5.5 servers to your organization in the future.
Your organization will never require interoperability between Exchange 2000 or Exchange 2003 and servers running earlier versions of Exchange Server.
Your organization does not use any connectors or gateway programs that run only in Exchange Server 5.5
All of the Mail servers in the organization must be running Exchange 2000 or Exchange 2003.