Add that email account to Mac mail, and sync all the data to that account. Manually transfer data using a dummy email account that can support IMAP. So, how can you move your emails or export Mac Mail to Outlook 2016? Well, you have two options. Mac Mail can only archive its data to MBOX format. If you are jumping ship (quitting Mac altogether and coming to Windows), you may find it difficult to get your data from Mac Mail to Windows Outlook because of the issue stated above. Mac Mail is the default email client in all Mac computers, offered by Apple itself. That is not a good news for users coming from Mac OS X and Mac Mail email client. Nor can you import data to Windows Outlook using any format other than PST itself. You cannot use this same file with any other email client.
All your emails, contacts, reminders from calendar, and other items are stored in PST in a locally stored database. Microsoft employs their own proprietary file format called PST for Windows Outlook.
