How do I have only ONE calendar show up on the IPhone that links with my laptop automatically? Right now I have three calendars showing: From My PC, Exchange and ICloud. Sometimes appointments end up on the wrong calendar and as a result donot update my laptop correctly. I want it simple and seamless - 1 calendar. I am not techno savvy so I need this in basic layman's terms. Thanks to anyone who can untangle this mess for me.