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.
garryshapeAsked:
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Vasil Michev (MVP)Commented:
If you want to be able to move mailboxes, you will need to establish Hybrid coexistence between the on-prem org and Exchange Online. Review the documentation on TechNet and the EDA, let us know if you have any questions:

https://technet.microsoft.com/en-us/library/jj200581(v=exchg.150).aspx
http://technet.microsoft.com/en-us/exdeploy2013/

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garryshapeAuthor Commented:
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
Vasil Michev (MVP)Commented:
Yup, sorry. The concepts are the same, but there are some differences indeed. For the second link, you have an option to select 2010 when starting the Exchange deployment assistant.
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garryshapeAuthor Commented:
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.
Vasil Michev (MVP)Commented:
AD FS is not required for Hybrid. Neither it's required to have matching UPN and SMTP. But both these will make it a lot easier on the end user :)
garryshapeAuthor Commented:
Ok thanks. Is there a contact at Microsoft that could help walk me through? Or would I need to open a $499 case?
Vasil Michev (MVP)Commented:
If you have over 150 seats, you qualify for FastTrack and MS will help you a great deal with the process. Go to the FastTrack site and fill in your details: https://deploy.office.com/getting-started
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