When I try to share my calendar in Outlook, I receive the following error: "Calendar sharing is not available with the following entries because of permission settings on your network."
When you right click on the calendar and go to share calendar, the sharing invitation will open. You will be asked to enter the email addresses of the recipients you would like to share your calendar with.
Please click on the "To" button and choose the individuals from the global address list.
NOTE: If you allow Outlook to auto-complete the email addresses, you will receive the error message.