Hybrid Migration : Exchange 2010 SP3 to O365

We have currently started the migration of  Exchange 2010 on-premises to O365 ...but the migration of our mailboxes hasn't started yet.
How do I migrate one mailbox from our existing Exchange 2010 SP3 server to Office 365 without affecting other mailboxes ?
I wanted to migrate only one user without losing his email and / or affecting other mailboxes but there is different option for it ...
I'm not sure how to do this-- step by step other than using the PowerShell command line...
Cedric DSystems EngineerAsked:
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Vasil Michev (MVP)Commented:
You can also use the EMC, look for example at this article: http://www.msexchange.org/articles-tutorials/office-365/exchange-online/configuring-exchange-hybrid-deployment-migrating-to-office-365-exchange-online-part13.html

It pretty much does the same as the PowerShell cmdlet.

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Cedric DSystems EngineerAuthor Commented:
Very helpful. Thank you for your prompt response.
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