When an activity is assigned to a user and an email is sent to the assignee with the calendar appointment, the ical is attached. However, when I open the file in Outlook 2013, it says "Meeting cannot be found in the calendar." I'm unable to save/add the meeting date into my calendar. Is there a way to resolve this?
I've also tried the activity iCal module, and I haven't been able to find a solution to add activities to Outlook effectively.