Forum Discussion

Iron Contributor

Apr 24, 2017

Solved

I created an Exchange Online mailbox but it doesn't appear in on-prem EAC. How do I fix?

I discovered this issue because the CRM for Outlook add-in (the modern one, not the full client) complained that a new user was not logging in with the same email address and is Dynamics 365. I c...

NunoAriasSilva
Apr 25, 2017
Hi Chris,

You can do softmatch SMTP to your user https://support.microsoft.com/en-us/help/2641663/how-to-use-smtp-matching-to-match-on-premises-user-accounts-to-office-365-user-accounts-for-directory-synchronization

Then this article can help you http://techgenix.com/match-office-365-mailbox-new-premises-user-hybrid-deployment/

Toan Mai

Copper Contributor

May 11, 2018

I have no solution for the issue you described other than save the email to a pst, delete the mailbox and recreate it but there is another way to proceed other than create it on prem then migrate it.

This is how I do it for new users.

I have an exchange 2013 CAS server in hybrid mode. This is where my Exchange Admin Center is.

Click recipients then mailboxes. You should see all your users.

Click the + sign then select Office 365 mailbox.

This action will create the user in AD and most importantly that user will show up in the EAC. Wait a little bit and you will see the newly created user on your domain controller as well as in the O365 Admin center. You will then have to assign a license to the user and the rest is as usual. There will be no need to migrate from on prem to online.