cc:Mail (including DB8 support)
Creative Business Solutions has a cc:Mail migration tool that is more updated than Lotus'.
Lotus' Migration Tools now support DB8.
Binary Tree has a tool which migrates mail, folder structure, appointments and meetings (including invitees and attendees), tasks, and notes.
OpenOne has a tool called Direct-TO-1 that lets email be migrated between Notes, Exchange, and a few other email systems.