The functionality in Exchange Hybrid is now quite mature. It’s been available since the launch of Office 365 (or even before if you include the embryotic support in Live@EDU) and provides the rich co-existence functionality that allows organizations to mix mailboxes on-premises and in the cloud, retaining much of the normal sharing capabilities people rely on for day-to-day collaboration.
M365 - Exchange Online Center
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Hybrid Deployment (2)
A few weeks ago, Microsoft released Exchange 2016 to the public. By now, some of you will have had the chance to play with the latest member in the Exchange Server family and perhaps have formed an opinion on whether it’s something you are willing to consider upgrading to now, or after few more Cumulative Updates have been released.
One decision to make when moving to Office 365, is determining how to move mailboxes. There are various options available and this makes it hard to see the forest through the trees. And choosing the right approach is no easy task. The decision is influenced by many variables such as the size of your organization, the impact on your users, the impact on your IT department, and the bandwidth of your internet connection.