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This method is especially useful if there is a lot of data to migrate and the process is bound to take a lot of time. One of the benefits of a hybrid configuration is that you get a great way to migrate your mailboxes to the cloud without having to pay for a third-party solution or do it yourself manually over many long weekends. How to Migrate Mailboxes from On-Premises Exchange to Exchange Online

A Hacker Explains: How Attackers Exploit Office 365 Vulnerabilities.The wizard will run a number of PowerShell commands behind the scenes to configure your local Exchange Server machine and Office 365 tenant, make connectors, and configure remote domains, encryption and so on. Review all of the information you’ve entered and click Update.Choose the right SSL certificates and click Next.For our purposes, choose the Configure my Client Access and Mailbox servers for secure mail transport (typical) option and click Next.Once they’ve been verified, click Next to continue. The wizard will check the credentials.Enter credentials for your on-prem Active Directory deployment and for your Office 365 tenant.Specify the Exchange Server machine you want to use or accept the one that the wizard has identified automatically.When the wizard has finished installing, it will open.The Hybrid Configuration Wizard tool will be downloaded and install itself automatically. In the left pane, navigate to Hybrid and click Enable. From the Exchange Admin Center, launch the Hybrid Configuration Wizard.To synchronize the two environments, take the following steps: To complete your hybrid deployment, you need to configure coexistence between your on-prem Exchange and Exchange Online. How to Set up a Hybrid Exchange/Office 365 Environment

Microsoft is working on changing this so that when all of your mailboxes are migrated to Office 365, you can decommission that last Exchange Server on your network, but for the time being, it remains a requirement.

This is because of the way the Office 365 system defers some things to on-premises Exchange Server machines some roles that the on-prem machine holds cannot be moved up to Office 365 in a supported way. Keep in mind that when you create a hybrid Exchange environment, you have to leave a single premises Exchange Server machine on your local network for the forseeable future.