In Outlook go to File > Open > Other User's Folder.Option 1: Using the Open Other User's Folder feature To open a shared Inbox, Contacts or Calendar folder: Important:the folder must be shared with the Reviewer permissions at least. If you need to open Tasks or Notes, you must use the second method, which uses the Delegates settings. The first method will allow you to open an Inbox, Contacts or Calendar folder. This article describes two ways to open a shared folder. Read the Knowledge Base article on How To Share Folders In Outlook 2011/2016 For Mac for information on how to share a folder. Before you can open a shared folder, you need to know who granted you access and what type of folder it is.