Exchange Server 5.5 and Exchange Server 2003 are running in mixed mode. One of our three Active Directory (AD) sites is in a separate forest and we would like to create a single forest to remove all of the Exchange 5.5 servers, which are only used for global address list (GAL) replications. How can we accomplish this?
We have a single Exchange organization and three AD sites connected through a Multiprotocol Label Switching (MPLS) cloud.
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You'll want to use your favorite Internet search engine to search for "interorg Exchange migrations" or similar keywords. A number of Exchange administration tools exist on the market to assist you with what you're trying to achieve.
Expert Advice: Tool suggestions for an Exchange Server migration
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11 tips in 11 minutes: Migrating from Exchange Server 5.5 to 2003
Reference Center: Exchange deployment and migration advice
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This was first published in February 2008
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