We are in process of migrating our users from Exchange 2003 to Exchange 2010 but have hit a number stumbling blocks along the way. Our first issue which is logged elsewhere is preventing us from completing the migration so for the time being we are stuck with user mailboxes split between the two exchange servers but that is not the issue I am inquiring about.
Users that are still on Exchange 2003 cannot see the Free/Busy schedule of users that have been migrated from e2k3 to e2k10. All other users whether they are existing e2k3 users or NEW e2k10 are unaffected and calendar scheduling appears fine. The email client seems to be irrelevant as the same thing happens in Entourage, Outlook, Apple Mail and OWA.
Any help would be greatly appreciated.