To create a shared calendar in Outlook, follow these steps:

Create a blank calendar

  1. Open Outlook and click Calendar on the navigation bar at the bottom of the screen.
  2. Click Home, Open Calendar and Create New Blank Calendar.
  3. Give this calendar a name and choose where to save it in your mailbox. 
  4. Click OK.

Share the calendar with others

  1. Open Outlook and click Calendar to the left of the screen.
  2. Right-click on your new calendar.
  3. Select Share and then Calendar Permissions.
  4. Click the Add button.
  5. Select the user that you would like to view your new calendar.
  6. Click on the Add -> button and click OK.
  7. Select the user's name in the dialog box that appears.
  8. Tick the box that says Folder Visible and click OK.
  9. Click Calendar on the menu on the left.
  10. Right-click on the calendar you want to share and select Share Calendar. This will send the recipient an invitation to view it.