You can share a personal calendar with another colleague by:

  1. Go to your calendar section in Outlook.
  2. Go to your Calendar then right click.
  3. Click Share ---> Share Calendar.
  4. It will then prompt you to email the person you would like to share the calendar with. You can set the amount of permissions in this email under Details.
  5. Once you send the email, the recipient will need to click Open This Calendar. 
  6. It will then open the personal calendar and display information based on the level of permissions granted.