Microsoft have just released a new version
of their Exchange Connector for Lotus Notes.
The Microsoft Exchange Server 2003
Connector for Lotus Notes supports messaging and calendaring interoperability
between Lotus Domino R5/R6 and Microsoft Exchange Server 2003 and Windows
Server 2003 Active Directory. This tool replaces the Connector that ships
with Exchange Server 2003 (including SP2), and includes several updates
to support better message fidelity when routing email between Exchange
and Domino, support of iNotes and Domino Web Access clients, enhanced Unicode
support and reliability.
it here or just migrate to Domino
and save a lot of hassel.