I am having problems with my Windows 8 Phone (HTC 8X) and Outlook.com. There are like 7 to 10 duplicate entries in Calendar and Contacts. I had this problem before and I solved it just deleting the duplicates. The problem is back. I can't do this every time. There is definitely a bug in Windows 8 Phone or Outlook.com. Can somebody help to fix this problem?

Thank you,