On July 10th, 2007 - Quest Migration Manager version 8.0 was made GA. This migration solution will now migrate organizations from Exchange 2000/2003 direct to Exchange 2007 with coexistence and synchronization.

http://www.quest.com/newsroom/news-releases-show.aspx?contentid=5886

Version 8.0 of Quest Migration Manager for Exchange has been enhanced to help users manage their e-mail migration.Features such as coexistence and ZeroIMPACTâ„¢ on the end us