Originally Posted by ELIH2
I have double calendar entries, I have no idea why, is there any way to avoid this???
I had the same problem after upgrading the OS. This is what my BES hosting provider said:
"If the calendar is duplicated on the device and not on your Outlook you will have to wipe your device and reactivate your BlackBerry, this will clear all data on the phone and allow the device to sync with the current calendar on the server. If you had previous calendar items on the phone before you activate it will duplicate because the BlackBerry will add your existing calendar items from the server to your BB".
So, a fresh Enterprise Activation fixed the problem for me - but then we don't know if you're on a BES.