My organization has 200 users mail box on exchange 2003 . I had configured exchange 2010 coexistance with exchange 2003 .After installed exchange 2010 and MX point to exchange 2010 . My quetion is currenly OWA point to Exchange 2010 and users who are from exchange 2003 can't use OWA . Exchange 2010 not redirect OWA traffice to exchange 2003 ? How to make it work ? Because i can't move all the users from exchange 2003 directly to exchange 2010 .Please share experience on my issue ?