If you need to link another account to OWA (gmail, yahoo, utmail, et al) go here
Contacts Not Automatically Appearing In "To/cc/bcc" Field(s)
Note: Email addresses will not auto-complete until you've typed them in at least once. Even if you've emailedjohn.doe@mccombs.utexas.edu a hundred times before the migration, you will actually have to type the entire address out at least once post migration. After that, Outlook will store that information and autocomplete the address for you the same as before. If you are unsure of someone's address, you can always open a new email message:
Click on Address Book
Enter the name you of the person you are looking for
Highlight the name you want
Click on To/ Cc/ or Bcc
Click OK
Multiple Requests for Credentials
Note:You may be prompted multiple times to re-enter your credentials (even if you selected Remember my credentials).
Old Deleted Emails Appearing in Inbox
Note: You may see old emails that you've deleted, appearing in your inbox marked as "unread". These emails were probably deleted from your Inbox and added to your Trash. However, if the Trash was not emptied prior to the migration then those emails were copied over. They are not duplicates or an indication of any further or ongoing issue. Simply delete them again. You can empty the Trash or not, after. That only affected the Migration and not normal operation.
Delete Your Current Account on Phone before Re-Adding the New One