How can I upgrade from Exchange Server 5.5 to Exchange Server 2003?

A. You can't upgrade directly to Exchange 2003. To upgrade from Exchange 5.5 to Exchange 2003, you must perform the following steps:

  1. Upgrade Exchange 5.5 to Service Pack 3 (SP3) or later.
  2. Upgrade to Exchange 2000 Server.
  3. Apply Exchange 2000 SP3 or later.
  4. Upgrade to Exchange 2003.
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