I use the Android calendar that came with my phone. I have it linked (or so I used to ) to a few gmail accounts. I was having issues with duplicate entries appearing, so clicked "sync" to see if it would resolve it. Instead, ALL of my entries on the calendar, including automatic holidays, disappeared. I looked at my google calendar on the laptop and it was blank as well. Please help! I had all of my business meetings, appointments, confirmation numbers, etc in there. Is there any way to retrieve the entries made from my phone? How can I avoid this in the future?