We have a newer Exchange 2010 installation and I've got several mailboxes migrated. My mailbox is migrated and my iPhone 4S is syncing just fine. However, I just migrated two additional IT Dept mailboxes and neither user can access their mail from their smartphone. One has an Android and one has an iPhone 4. I see our firewall passing the traffic successfully. The android is getting a bad username or password error, despite using the correct username and password and the other iPhone is getting a cannot connect to mail error. Any idea where to begin troubleshooting when I know it is not a problem with the whole system since mine is working? In addition, I've made sure we are all not members of the AD Domain Admins group.
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