I found this via a top search result, only my issue was for an on-prem to on-prem migration (Exchange 2010 to Exchange 2016.) I figured I'd tack on to this older ticket in hopes it helps someone else. If it is listed, it's the client (or connectivity from the client when it does another Autodiscover to map the shared mailbox), if isn't listed, then it's something to do with the automapping not being pushed through server side. Look in the XML tab and scroll down to the bottom and see if you see an section listing the Shared Mailbox. Once it completes, you will see a Result, Log and XML tab. To do this, Ctrl-right click the Outlook icon in the notification area of the taskbar, and choose Test email autoconfiguration, enter the email address and password and only leave Autodiscover ticked.

If you want to verify Outlook is receiving the correct details, you can use the Test Email Autoconfiguration to retreive the Autodiscover XML, which will show if the mailboxes to auto map are being provided by Exchange Online. Technically it works the same way as on-premises.Īfter making the change, you should expect to see the mailbox auto-map within at the most an hour, but within 10-15 minutes would be normal if you re-launch the client. The setting itself will be stored in Office 365 within an AD that sits behind your Exchange Online environment. By default, it adds the automapping, which should mean just a remove and re-add should ensure that it has been configured the way you intend it to work. The link above should show you the only setting service-side available to control it.

Outlook 2016 inbox not showing emails