I have a user that was migrated to office 365 that was previously setup over a basic imap mail provider. His .pst file is 80GB. I would like to get this integrated into office 365 so it's not stored on his machine locally. How can I do this without causing duplicate emails to show up on his computer? Also I'm guessing I'll have to mail them a copy of the .pst since it's so large.
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