How to Share an Outlook Calendar (Old)
1. go to the Calendar section in outlook.

2. press the share button in the top bar.

3. select the calendar you want to share. (the calendar must be one you made or have ownership over)

4. when the properties menu opens under permissions tab, click add.

5. search the person you want to share the calendar with, then press Add and OK.

6. back in permissions select the permissions you want them to have and press OK to apply your changes.
