Office for Mac 2011 crashed all of a sudden today. Would not restart. Finally got SyncServices quit and tried to import 2011 data into the new Outlook 365 for Mac. It imported my email accounts okay, but not all of my past messages. I only have the messages going back to part of December. How do I get all the messages back that were in my Outlook 2011?

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Disclaimer:

The actions taken are based upon my position as Community Moderator – P.M Jones. I determined that rather than in getting started this actually is question about recovering mail from OutLook. If it's determined to be incorrect other moderators are welcomed to Move again or answer.