What would make a Shared Mailbox NOT show up in Outlook (2016, ProPlus C2R)?

Question

What setting would make a Shared Mailbox NOT show up for a user?&nbsp;User is using Office 365 ProPlus (click to run), version 2016 (first release deferred channel).

steve goodman · Answer

The link above should show you the only setting service-side available to control it. 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.&nbsp;The setting itself will be stored in Office 365 within an AD that sits behind&nbsp;your Exchange Online environment. Technically it works the same way as on-premises.&nbsp;&nbsp;After 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.&nbsp;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.&nbsp;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. Once it completes, you will see a Result, Log and XML tab. Look in the XML tab and scroll down to the bottom and see if you see an &lt;AlternativeMailbox&gt; section listing the Shared Mailbox.&nbsp;If it is listed, it's the client (or connectivity from the client when it does&nbsp;another Autodiscover to map the shared mailbox), if isn't listed, then it's something to do with the automapping not being pushed through&nbsp;server side.&nbsp;Steve

c_the_s · Answer

A couple times a user here hasn't seen the Shared Mailbox in desktop but did in OWA, we would delete their Outlook profile and recreate it. That, for us at least, got the Shared Mailbox to show up.

steve goodman · Answer

Hiya,&nbsp;If you are seeing the shared mailbox automatically add itself to the user with permissions Outlook profile, then it is being auto mapped. This is the default either via the portal or via PowerShell.&nbsp;To remove auto mapping, remove and re-add the permission using PowerShell. This article here takes you through the process:&nbsp;How to remove automapping for a shared mailbox in Office 365&nbsp;Steve

imran khan · Answer

I just had the issue where shared mailbox will not show up in outlook. Upon checking the settings in Office 365 admin portal (Activ Users/Mail Settings/Email Apps) the MAPI and IMAP settings were disabled. After enabling, and restarting the outlook few times, shared folder became available.&nbsp;

steve goodman · Answer

(By the way, if you are asking about the other way around, i.e. why&nbsp;isn't it automatically mapping) then the first point of call is to remove and re-add the permission. For example, if you move a mailbox from on-premises, this could explain why although it kept the permission auto mapping isn't working.

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What would make a Shared Mailbox NOT show up in Outlook (2016, ProPlus C2R)?

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