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Exchange Hybrid architecture

A hybrid deployment provides the seamless look and feel of a single Exchange organization between an on-premises Exchange organization and an Exchange Online organization. In addition, a hybrid deployment can serve as an intermediate step to moving completely to Exchange Online. Before configuring the Exchange Hybrid deployment, you want to get familiar with the Exchange Hybrid deployment architecture. Let’s find out more with an Exchange Hybrid architecture diagram.

Exchange Hybrid deployment architecture diagram

There will be an on-premises Exchange organization and an Exchange Online organization (Office 365 for Enterprises). In this scenario, we have only the domain. The on-premises Exchange Server EX03-2016 is the Exchange Hybrid server.

Exchange hybrid architecture diagram

In the next article, we will look at how to create an Office 365 trial tenant.



ALI TAJRAN is a passionate IT Architect, IT Consultant, and Microsoft Certified Trainer. He started Information Technology at a very young age, and his goal is to teach and inspire others. Read more »

This Post Has 4 Comments

  1. Hi Ali,

    Nice series about Exchange Hybrid.
    A scenario where there is a mail gateway in place in front of your exchange server that receives the mail first. Is something I mis in a lot of documentation? Microsoft only stated that there cannot be a device, service, or server in front of a hybrid configuration where mail must flow between Onprem and EXO.

    What kind of scenario should you use? A second NIC on the Exchange server, that’s receive the mail from EXO? In a situation where you cannot abandon the mail gateway (for now) and mailboxes still reside Onprem and in Exchange Online?

    1. Hi Maarten,

      Glad that you like the Exchange Hybrid course.

      You miss that in the Microsoft documentation, and Microsoft does not recommend it because:

      1. I will take more time for the Microsoft engineers to troubleshoot.
      2. They want to brand their hygiene solution, which is EOP (Exchange Online Protection).

      I have an article in the work that will explain how you should configure Exchange Hybrid with a third-party spam filter. Hopefully, I can release it next week. Once it’s out, I will update this comment and provide a link to the article.

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