For those who wish to script the migration from Lotus Domino to Exchange 2007, PowerShell can be extremely helpful. I wrote the below script for a few customers who wanted more extensive control over their migration, this script can be easily tweaked to meet individual needs.
DISCLAIMER: This script is a sample only, not officially supported by Microsoft.
What's going on here is the script is reading from a file called c:\dominousers.txt. This file should contain the list of mailboxes you wish to migrate. An example of the expected contents:
Marc Nivens/DOMINO Nino Bilic/DOMINO John Smith/DOMINO
So once you have your list of users in the file, all you need to do is run the script. It will move each user specified in the file and will log any errors to a log called c:\miglog.txt. This of course can be changed to meet more specific needs. An example of this would be changing the move-dominomailbox command to move-dominouser and specifying the correct switches. You could do the entire migration with just this script and a text file that contains the list of users that need to be migrated.