I need a way of migrating mail to a new Exchange 2003 installation. Currently we have a unix mail server (managed appliance - probably sendmail) We have around 1000 mailboxes populated with mail. How can I migrate users existing mail to their respective mailboxes on the Exchange server. When Exchange goes into production the old server will be killed so we are using just one domain for this.
Does anyone know of a tool that will POP into the old server's mailboxes and transfer the mail to their Exchange mailboxes?