Unable to remove additional Outlook mailboxes (4228244)

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Title

Unable to remove additional Outlook mailboxes
Description

Having issues with Outlook additional mailboxes. Either not able to remove them or they keep getting added.
Cause

This may be caused by an Microsoft Exchange feature called Auto-Mapping. By default, the mailbox auto-mapping feature uses Autodiscover to automatically open the mailbox in the delegate's Outlook profile (in addition to their own mailbox).
Resolution

To disable Auto-Mapping follow the steps below:
• Use the Add-MailboxPermission cmdlet in the Exchange Management Shell to assign the Full Access permission with the -AutoMapping $false setting. For more information, see the Use the Exchange Management Shell to assign the Full Access permission to mailboxes section in this topic.
• Assign the Full Access permission to a (mail-enabled) security group. The mailbox won't open in the Outlook profile of each member.”
Steps to set auto-mapping to false are HERE
Defect ID

DAMS-3187
Additional Information

Source:
https://technet.microsoft.com/en-us/library/hh529943.aspx
https://technet.microsoft.com/en-us/library/jj919240(v=exchg.160).aspx

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