How to access another user/department/shared mailbox in Outlook Web Access
Posted by Chase Goodall, Last modified by Donald Sloat on 07 May 2018 04:52 PM
  1. Login to Outlook Web Access (https://outlook.office365.com)
  2. Right click on your name in the folder list.
  3. Choose Add Shared Folder
  4. Type the name of the person whose folder you wish to open and click Add

  5. The folder will appear at the bottom of your folder list.