Office 365 Migration

We recently migrated to Office 365 and have been operational for a month.  We discovered that one of the user mailboxes did not migrate correctly.   Exchange services have been shut off on the on-premise server since migration.  Can I safely restart Exchange services on the on-premise server and reconnect to the problematic mailbox without disrupting Office 365 operations?  I would like to verify what the mailbox looked like just prior to migration.
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jspazianoctoAsked:
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Vasil Michev (MVP)Commented:
It depends, the only way you will know for sure is if you start it. Depending on the kind of migration you performed however, there might not even be an on-prem mailbox anymore.
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akbCommented:
Just make sure there are no MX records still pointing to your old Exchange Server first. If there are none then It should be safe to start your old exchange server.
Use this web site to check: http://mxtoolbox.com/
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jspazianoctoAuthor Commented:
Closed.  Thank you.
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akbCommented:
Question answered.
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