If you are using Outlook for Mac you will need to manually remove and re-add your profile after migration. For more information, you can look at the account setup steps located here or follow the below guidance.
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Use the Finder application to navigate to Microsoft Outlook.
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Right click on the Microsoft Outlook icon to bring up the contextual menu. From this menu, select Show Package Contents.
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Open the Contents folder.
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Open the Shared Support folder.
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Double click Outlook Profile Manager to open the program.
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In the manager window, highlight the profile you would like to delete and select the remove (-) button.
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To create a new profile, in the manager window, select the add (+) button.