What is Migration in Exchange Server 2007?

Migration is the scenario in which you upgrade to Exchange 2007 by migrating data from a non-Exchange messaging system to Exchange 2007 or from an existing Exchange organization to a completely new Exchange organization, without retaining any of the Exchange configuration data in the first organization. For example, when merging with another company, you can perform a migration. In this scenario, you move mailboxes and data to the other company’s Exchange organization, without retaining any of the configuration data from your existing Exchange organization. Another example is when upgrading from Lotus Notes to Exchange 2007, you perform a migration. In this scenario, you must move mailboxes and data to the new Exchange 2007 organization, without retaining any of the data from the Lotus Notes organization.

The migration process includes installing a completely new Exchange 2007 organization, and then migrating mailboxes from the old messaging system to the new Exchange 2007 messaging system, using various tools for migration.