NOTE: To access another person's calendar, that person must have granted you permission to it. 

1. Open Outlook.
2. Click the Calendar tab.
3. Click Open Calendar, then click Open Shared Calendar.
   
   
    
4. Enter the name or email address of the person or shared mailbox calendar you wish to access.
   TIP: Click Name to search for a person or room in the address book.
5. Click OK.
   
   
   
   The shared calendar will appear side-by-side with your personal calendar.