Please set the internet free/busy options with clicking the Other Free/Busy button in the Calendar Properties dialog box. There are four kinds of permission levels allowing others to view the free and busy information in the selected calendar: None Free/Busy time Free/Busy time, subject, location and Full Details. Step 3: Now the Calendar Properties dialog box comes out, please go to the Permissions section, and check one of Read permission levels according to your own needs. Step 2: Go to the Share group on the Home tab, and click the Calendar Permissions button. Step 1: Shift to the Calendar view, and select a calendar that you will share its free and busy information with others under My Calendars. This method will show you how to set or change the permission lever for others viewing your free and busy information easily in Microsoft Outlook 20. Set permission for viewing Free/Busy information in Outlook 20