Outlook not updating other users folder
To set up sharing, those users must give you the "Reviewer" permission level (at least) for their calendars or mailbox folders either by modifying their respective permissions, or by configuring delegate access for you.
For more about sharing Exchange calendars and mailbox folders, see: Although you can add another user's mailbox to your Folder List without having any permissions for that person's mailbox, you will not be able to open the calendar or folders unless the owner has given you at least the "Reviewer" permission level.
At Indiana University, if you've been granted permission to view another person's IU Exchange calendar or mailbox folders, you can view them in Outlook 2016, 2013, or 2010 for Windows using either of the methods listed here.
You can use Microsoft Outlook to view the Exchange calendar and mailbox folders of others within your organization (e.g., at Indiana University) only if they have shared them with you.
Maybe if I | type some more we can obtain a good third measurement.