This document shows how to change the permissions of a certain folder to allow others access to its contents. The following instructions are for Microsoft Outlook 2011.
Open Outlook 2011 and click on the folder you would like to share and then click the Permissions icon.
In the Find textbox, type the name of the person you are looking for and then click Find.
Click on the name you were searching for and then click OK.
Click the boxes to allow amount of access you would like the person you are sharing permissions with to have and then click OK.
A quick Saving Permissions alert will come and go and your desired folder will be now be shared.