When you try to create a mailbox by using Exchange Admin Center (EAC) in a Microsoft Exchange Server 2013 environment, the suffix for the User logon name box only lists the root domain names. However, the expected behavior is for root domain names and child domain names to be listed.


This issue occurs because the domain list function only keeps the root domain, and then returns it to the domain picker.


To resolve this issue, install the following cumulative update:

2892464 Description of Cumulative Update 3 for Exchange Server 2013


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about how to use EAC to create a mailbox, go to the following Microsoft website:

How to manage mail users in Exchange 2013

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!