How to migrate mail server from Notes R5 to FC1 Smtp

[yavorsky gaetan]

Hi,
I have a remote Lotus Notes server and about 40 mail boxes to migrate to 
a new FC1 server.
Of course, creating and managing users with FC1 is not a problem, but 
the trick is that I need to keep history for the Notes users.
Did somebody already do this ?
What can I use to transfert old mails to the new FC1 server ?
Gaetan.