We are planning to migrate to Office 365 - Exchange Online (broadening to Lync and SharePoint at a later stage). We have a number of staff who will form a pilot team and test the new functionality. We would need them to experience it as close to what it will be as possible, so ideally this will be will be with their current AD and on-premise Exchange accounts.
We have an on-premise Exchange 2010 server so I understand we wouldn't be able to use a staged migration to migrate some staff but not others. Am I therefore correct in thinking that we would have to go to a hybrid deployment, move their mailboxes to O365 and that's it or are there any other considerations?