Adding Domain in Existing Hybrid Configuration

Scenario 1 –

• Domain never Existed in the Forest.
• All Mailboxes will be in the Cloud.
• Hybrid Exchange Server will be used only for Recipient management.

• Add the Additional Domain in Office Admin Center
• Add required DNS records – Point MX,Autodiscover,SPF to the Cloud

Open On Premises Active Directory –

Active Directory Domains And Trust.

Properties

Add the Additional Suffix –

Now you can set –

• UserLogonName@newDomain.com
• PrimarySmtp@newdomain.com

To Change Email Addresses ,used Accepted Domain and Email Address Policies In Exchange Control Panel.

Try Creating test users and check user sync to the cloud with the new domain.

Scenario 2 –

• Domain Already Exist in the Forest.
• All Mailboxes with this domain exist in the Forest.
• Mailboxes are yet to move to the cloud but hybrid configuration was completed with the new domain.

• Add the Additional Domain in Office Admin Center
• Add only verification DNS
• Don’t Change MX or Auto discover Records.

Open On Premises Active Directory –

Active Directory Domains And Trust.

Properties

Add the Additional Suffix –

Now you can set –

• UserLogonName@newDomain.com
• PrimarySmtp@newdomain.com

To Change Email Addresses ,use Accepted Domain and Email Address Policies In Exchange Control Panel.

Add the Domain in Organization Sharing –

Add the Domain in Existing Hybrid Mail flow Connectors –

• From Office 365 To Your Organization’s Email Server

Edit the Connector – Add Domain – Validate the Connector before Applying.

In my Case the domain was from a different site al together

So Added a new migration End Point

Followed the normal Process to Migrate Mailboxes use the new migration end point.

See –

Office 365 Hybrid Configuration Wizard Step by Step

Office 365 Hybrid Duplicate Mailboxes