Migration on-prem to Online

AtomAdmin Atom 1 Reputation point

Good day all... the user was given o365 Bus std,,, but already has Exchange Plan1, this was setup to O365 and working, now i have been asked to migrate the user to O365 Online,
Does exchange Plan 1 automatically update with o365 because if i take a the exchange plan 1 license away outlook has to be re-configured again, does this mean the emails are already in the cloud or where are they.
Thank you

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