Taken from our Resources for Interoperability and Migration from Lotus Domino page:
Microsoft Transporter for Lotus Domino configures Directory synchronization and Free/Busy lookups between Lotus Domino 6 or 7 and Exchange Server 2007 and Windows Server 2003 Active Directory. SMTP is used as the mail routing transport between Lotus Domino 6 or 7 and Exchange Server 2007.
Transporter also migrates users, mail databases and applications from Lotus Domino 5, 6 or 7 to Windows Server 2003 Active Directory, Exchange Server 2007 and Windows SharePoint Services 3.0.
Please read the Release Notes for important information prior to installing Transporter.
More information will be available shortly on the Collabtools blog.