Hosted Exchange and 365 coexistence?

Is it possible to migrate only a portion of users from a domain using Exchange 2003, into office 365/Exchange online?
Is there a way to configure domain settings so that email from some users goes to 365 servers, and the rest goes to the existing on site Exchange server?
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Vasil Michev (MVP)Connect With a Mentor Commented:
What you are looking for is Staged Migration:

Also, a comparison between the different migration types:
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