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Exchange 2010 On-Premise - move some mailboxes to O365?

If I have a current Exchange 2010 environment and also have the licenses for O365 Exchange Online, what would I need to do to migrate some mailboxes from some database from my Exchange 2010 on-premise server to the Exchange Online server?
Do I have to deploy a new server on-premise?

I plan to setup Data Availability Groups as well, should I do that before putting Exchange Online into the picture?
I would only have Data Availability Groups for on-premise mailboxes.

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Vasil Michev (MVP)

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Garry Shape

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I noticed the articles refer to Exchange 2013.
I am on Exchange 2010, should the main idea of the articles still apply and help me?
Is this article series more applicable? https://technet.microsoft.com/en-us/library/gg577584(v=exchg.141).aspx

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Vasil Michev (MVP)

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Garry Shape

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Perfect thanks
Hope I don't mess something up with ADFS
I'm assuming I need to update User Principal Names to match e-mail addresses before all of this...
Because there is a child domain in the forest that is going to have duplicate SamAccountNames with users in the parent forest.

SOLUTION

Vasil Michev (MVP)

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Garry Shape

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Ok thanks. Is there a contact at Microsoft that could help walk me through? Or would I need to open a $499 case?

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Vasil Michev (MVP)

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