I think that I am the first person who had this issue even after updating the ios in my Iphone. This sounds little weird but actually all the entries in Iphone calendar are changed to double entries. It was happened when I updated the OS to 3.01 and as a result I have done hard reset to my phone. I was really unhappy after this. I had reset again and reloaded the calendar from itunes. All efforts fail. i was unable to point out whether is it is the new upgrade problem or reset? Is this issue can be fixed? If you have gone through similar problem and resolved it successfully then provide me some tips to correct my Iphone too. I will be very happy and appreciated.