1. Open Outlook Desktop.
2. Click on Calendar icon.
3. Under My Calendar, right-click on your Calendar, then choose properties…
4. Select the tab Permissions.
5. Select the name of the person you want to stop sharing calendar with, then click Remove.
When you finish, click OK.
How to stop sharing Calendar in WorldPosta webmail
1. Open WorldPosta Webmail. (mail.worldposta.com)
2. From the pane above, click on Calendar.
3. In the left pane, under MY CALENDAR, right click on your calendar, then choose Permissions…
4. Click on
beside the name of the person you want to remove.
5. When you finish, Click Save.