I have a situation where a client has their domain name with Domainz who also provide an exchange Business Essentials plan. Domainz appear to be charging them twice for the one domain and one email address but getting anything out of Domainz is like pulling teeth. They had no email for three weeks recently and they've had enough.

So they've asked me to look at dropping everything and starting again with their own exchange online plan.

My understanding of O365 is a domain can only be active on one account at a time so I'm wondering how this might work.

Is there anything stopping us from exporting their email to pst, transferring the domain elsewhere (we can access the UDAI code), creating a new microsoft account for the existing domain and setting the DNS records to a new website and the new MS account ? Then I assume importing the email into the new account is easy enough, otherwise they can just create a new account in Outlook.

They've been given an admin@domain.onmicrosoft.com login but it doesn't work, so can I create another using the same domain name ?

Or is there a better way ?

Patching it up with Domainz is not an option !