Hi hope someone can assist I am migrating users from Exchange 5.5 to Exchange 2003 cross site using exmerge in batch mode. However, I have come across a problem with calendar entries that were created before the migration of a user took place. If a user is on 5.5 and makes creates an appointment in a calendar and then that user is migrated from 5.5 to 2003, then when that user tries to amend the entry they are denied access. Looking at the permissions on the calendar folder for the mailbox where the appointment was placed which is still on 5.5 then the explicit permission settings of the users migrated show up as X500 addresses. Adding an X500 address to the migrated users proxy addresses makes no difference. What I have found that I need to do is change the default permission to Owner to allow this to work. This is not a good solution and I would like some thoughts on a better one. Thanks Mark Shevill Mobile: +44 7932 625510 Home Mail: Mark.Shevill@xxxxxxxxxxx Business Mail: Mark.Shevill@xxxxxxxxx Web: www.MSCCS.net