Update 4/9/2019: to read about additional features released in the Hybrid Agent, please go here.The moment you’ve all been waiting for has arrived! We are pleased to announce the Microsoft Hybrid Agent for Exchange Server is now available for preview! We talked in some depth about the Hybrid Agent back at Ignite 2018 in Orlando, if you want a refresher on what we covered there you can see that recording here. The Hybrid Agent was designed to remove some of the existing challenges customers face today when establishing a Hybrid Exchange environment. This includes, but is not limited to, adding external DNS entries, updating certificates, and allowing inbound network connections through the firewall. From today, when running the Hybrid Configuration Wizard, you are presented with a new option for establishing hybrid; “Modern Hybrid”. Modern Hybrid is offered for both Minimal and Full Hybrid Configurations. This new option will only be presented if you have never run the Hybrid Configuration Wizard. If you have successfully established Hybrid in either Minimal or Full config before this release, this new option will not be available. This feature will install an agent, built on the same technology as Azure Application Proxy, which will publish the Exchange on-premises environment to Exchange Online to support Free/busy and mailbox migrations without many of the challenges customers previously faced with external DNS, publishing of EWS and inbound connections ports having to be opened. The secret sauce here to explain how this works is that the Hybrid Agent registers a custom URL for only your tenant in the following format:
<guid>.resource.mailboxmigration.his.msappproxy.netThis URL is then used by the Organization Relationship or the Intra Organization Connector and the Mailbox Replication Service to route requests from your tenant to on premises. This URL is only accessible from Exchange Online. Free/busy requests from cloud users to on premises and mailbox migrations to/from the cloud are the two flows currently supported through the Hybrid Agent. Yes, this new feature offers some great new capabilities and we’re very proud of it, but the Hybrid Agent preview still has a few constraints:
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