During the Set Forwarding actions the following may be displayed in the log file when a failure occurs.
ERROR: [7456-6-46-00000000] Unable to initialize GroupWise
Unable to find active GroupWise application!
At the time of this error, a message from the Groupwise Client may be observed stating that an update is available.
The Groupwise Client may not be able to initialize correctly for Groupwise Migrator to interface with it if this message is popping up.
The Set-Forwarding functionality opens the Groupwise client in the background and traces through the menus in order to set the forwarding rule in the mailbox.
Update the Groupwise Client with a build which does not display this message when the Client is opened and retry the Set Forwarding.