Outlook 2016 shared mailboxes not updating
Every Microsoft Exchange Server or Exchange Online administrator knows about regular mailboxes.
But how many know that they can add shared mailboxes to their deployment, at no cost?
If you are the “owner” of a Shared Mailbox account, your best recourse is to turn off “Download shared folders,” as explained above or upgrade to Outlook 2016.
Try one of the following suggestions to fix the issue.
Only admins can create a shared mailbox and give users permissions to the shared mailbox.
If you want to open a shared mailbox using Outlook on the web or Outlook Web App instead of Outlook, see Open and use a shared mailbox in Outlook Web App.
Rather, this type of mailbox is "generally configured to allow logon access for multiple users." In other words, a shared mailbox is a functional mailbox that one or more users access for a specific purpose.
For example, suppose you ran a doctor's office.
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Simple solution – turn off “Download shared folders.” If you do this, all Shared Folders will no longer be stored in your offline cache.