Exchange Hybrid - Exchange online

Question

We are in the beginning stages of migrating exchange on-prem to exchange online. This will be a hybrid deployment. The consultant said that we will need a public SSL certificate. The consultant stated that the name on the cert must be resolvable. He said it could be anything. A new name that we create or our existing domain mail.domain? Also stated that we needed an IP address. confused by what I need. Thanks.

Answer 1

Hi @mara2021 ，

Yes .

For both syncing on-prem AD with Office 365 and deploying hybrid，You need to register/purchase the domain name in the domain registration provider and add it to Office 365 and on-premises AD. This is different from the local AD domain you already have(mail.contoso.com) .

 

Additionally, to configure Exchange Hybrid, on-premises organizations need to install an SSL certificate onto their Web/Exchange server to initiate a secure session with the browser. SSL certificates need to be purchased by a trusted public certification authority (CA).  

 

The following table outlines the minimum suggested FQDNs that should be included on certificates configured for use in a hybrid deployment.

For more information about the prerequisites for deploying a hybrid environment, you can refer to the following links:

 

Hybrid deployment prerequisites | Microsoft Learn

Certificate requirements for hybrid deployments | Microsoft Learn

 

Hope the above suggestions are helpful to you!

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Answer 2

Deleting my answer. The answer above covers it but was posted while I was composing my answer to your question. Ignore.