troubleshooting Question

Outlook doesn't detect that a mailbox has been migrated to Office 365

Avatar of Joergen Lind
Joergen LindFlag for Denmark asked on
Microsoft OfficeExchangeMicrosoft 365
6 Comments1 Solution642 ViewsLast Modified:
We're in the process of migrating our On-Premise Exchange 2013 CU12 to Office 365.
  • Everything is set up.
  • Azure AD Connector is handling the account synchronization
  • It's a hybrid setup.
  • I've migrated a mailbox without errors.
The Mac running Office 365, (Version 16.18) picked up the change in mailserver, prompted for my Office365 login and continued working as before, except it is connecting to Office365.

Now, the PC client, using the same mailbox (it's not a shared mailbox, I'm just running on a PC and a Mac concurrently)  is not so fortunate. The PC is on a Windows domain, the user is logging on to the PDC with DOMAIN\account login.
The Outlook (Outlook for Office 365 MSO (16.0.10827.20118) doesn't pick up the change in mailserver. Instead it connects to the on-premise Exchange Server and says that the mailbox was last updated on Oct 16 2018.

If I run an Autodiscover test from the PC Outlook client, it looks very nice:

<?xml version="1.0" encoding="utf-8"?>
<Autodiscover xmlns="">
  <Response xmlns="">
      <DisplayName>My account</DisplayName>
      <LegacyDN>/o=ExchangeLabs/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=37345743bcd0a45d6a18aff6-accountname</LegacyDN>
      <Protocol Type="mapiHttp" Version="1">
          <OWAUrl AuthenticationMethod="LiveIdFba, OAuth"></OWAUrl>
          <OWAUrl AuthenticationMethod="Fba"></OWAUrl>
        <DisplayName>SharedMailbox1 name</DisplayName>
        <DisplayName>SharedMailbox2 Name</DisplayName>

So, why doesn't Outlook pick up the changes.

This is a test migration that should reflect any user in our organisation. So, deleting the Outlook account and setting it up again it NOT the solution that I am looking for.

The mailbox in the iPhone (native App), also doesn't pick up the changes, but I'm not entirely sure if this is expected behavior.

Thanks for any input and/or directions.

Have a great day!

Joergen Lind

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