At Options > Calendar sharing, you can release your appointments, the entire schedule or your call reports for viewing in other programs (e.g. Google calendar or Outlook) or to make them available to other persons.
The calendar sharing is an iCal feed in the form of an internet address, which you can add as internet calendar to other programs. Only persons who know this address can see your calendar. If you do not provide the internet address to anyone, the calendar remains private. You can Regenerate addresses or Stop sharing at any time.
You can find out how to integrate your schedule e.g. into Outlook at How can I synchronize my calendar in portatour® with Outlook?.
Hint: The frequency of the update depends on the program you are using. It is possible that the calendar is queried less frequently by your program.
Hint: Please note that the portatour® calendar sharing is unidirectional. Any changes you carry out in your program will not be synchronized back to portatour®.