By default, the organisation has set calendar permissions so that everyone can see if someone is busy. If you would like to share more of your calendar details with specific individuals, then please read on.
Open your Outlook desktop client.
Click on the Calendar icon in the bottom left-hand corner of the window.
Next, click on the Share calendar option in the ribbon at the top of the screen. This will display your email address and the word Calendar - click on Calendar
You will see a Calendar Properties window
Click on the Add button to open the Address Book. Search and double-click on the user you want to add. Click OK.
They will appear in the list (as per previous screenshot).
Select the relevant option from the list of permissions to share your details with them.
Click OK.
Repeat the process for each user you want to share your calendar with.