When inviting via Outlook, Notes or iCal the calendar in PP is empty. Noone outside the invitees can see if a meeting is to be or not. Possibility to send an invitation to PP and automatical import it to its calendar.
The top ideas with status Quality Backlog are discussed on a regular basis with the design team. These should be minor development, and could include hygiene factors, little things that create a wow effect and ideas that could have a positive effect on a lot of users.