If you see the following error when attempting to import Outlook 2011 data, create a new profile (identity) and set it as the default, then attempt the import again. This data set was called an 'identity' in Outlook 2011. The Outlook data includes the information associated with a specific Outlook 2011 account: email messages, contacts, tasks, calendars, and settings. Use this feature when upgrading from one computer to another, or when upgrading to Outlook 2016 for Mac.
Outlook for Mac 2011 data is one of the options on the Import page.
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