How to Migrate from an Internet Messaging System to Exchange Server 2003

This topic explains how to migrate a group of users from an Internet messaging system to Exchange 2003. These guidelines consist of extracting data from an IMAP4 server and immediately importing the data into Exchange 2003. To migrate data from an Internet messaging system to Exchange 2003, the Exchange Migration Wizard requires mailbox access for each user who is migrated. To provide this access, including information about the user accounts and passwords, you must create an imapusr.csv file. If you have performed an LDAP export using the Exchange Migration Wizard, you can find a basic imapusr.csv file in the resulting migration folder.

To successfully complete the procedures in this topic, ensure that the server on which you run the Exchange Migration Wizard meets the following requirements:

• The server is running Exchange Server 2003.

• You have network connectivity to the Internet messaging system.

• You have administrative permissions in Exchange 2003.

• Using the Exchange Migration Wizard, you have exported recipient information from the Internet messaging system through LDAP.

1. How to Prepare the Exchange Migration Wizard for an Internet Messaging System migration.

2. How to Migrate Users and Mailboxes from an Internet Messaging System to Exchange 2003.

3. How to View the Application Event Log for Migration Information.

For conceptual information about interoperating with and migrating from other non-Exchange messaging systems to Exchange Server 2003, see Interoperating with and Migrating from Other Non-Exchange Messaging Systems to Exchange Server 2003.