Source: GroupWise Migration Utility for Microsoft Exchange.
Explanation: The Migration Utility could not read the list of mailboxes in your Exchange system.
Possible Cause: The user that is running the Migration Utility does not have administrator rights to the Exchange server or the Domain object in the Exchange system.
Action: Configure the user that runs the Migration Utility to have administrator rights, as described in Designating a Service Account Administrator on Exchange 5.5 or Ensuring Administrative Rights on Exchange 2000/2003, depending on your version of Exchange.
Possible Cause: You are running the Migration Utility on a server or workstation other than the Exchange server where the mailboxes are located, and the server or workstation does not have a username and password that matches a username and password with administrator rights on the Exchange server.
Action: Set up a username and password on the server or workstation where you are running the Migration utility that matches a username and password on the Exchange server.