Hi NET Yeung, I would like to know if you want to add a subdomain to Office 365 and update the users’ email address. If so, please follow the steps below: 1. Add your subdomain like any domain you added. Note: Don’t forget to add the DNS records at your DNS host provider to use the Office 365 online services. 2. Enter Active Users in the Office 365 portal. 3. Click the box of Select a View and click New View . 4. Name your view and select the domain you want to change, then save the view 5. Click Select a View box again and click the view you create. 6. Check all users in the view and click EDIT on the right. Here is a related screenshot for your reference: 7. Change users’ domain to the subdomain and submit your change. If anything is unclear, please update here. Regards, Shirley
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