Question : Problem: Blackberry Calendar duplicates when synching

i have a user who has a blackberry storm that synchs calendar and contacts through desktop manager.  I have a 2 way synch between the device and the outlook profile.  when i set the synch on the calendar to 5 days, it works OK.  when it is set to a longer period...it duplicates many calendar items....recurring and single instances.
how come it does this...or better yet....how do I stop this?
Thanks

Answer : Problem: Blackberry Calendar duplicates when synching

Hi, these issues with Calendar duplicates are very common when you change the default sync period.  In short use will have to use "Desktop > Backup and restore > Advanced" to clear the current calendar and then resync the calendar.  At times you have to reset the sync setting and configure them again but set calendar to "future items" only and then after a few successful syncs over a few days change the settings.  Please make sure you take a backup of the device before proceeding.