Hi,
I just found out from RIM Technical Support that there is a patch for both issues:
1. Duplicate Calendar Entries when syncing with Desktop Manager
2. No calendar alarm notification.
3. Other issues related to the Calendar on v4.2.2 of the BlackBerry OS
Here's how to fix it:
Step 1: Go to
BlackBerry
Click on the correct link - whether you are an Internet Service or BlackBerry Enterprise Server user/admin.
Step 2: Apply the calendar patch as directed in the instructions.
Step 3: IMPORTANT (NOT LISTED ON RIM SITE) If you have any calendar events on your BlackBerry for the future (most of us have), then you need to delete your entire BlackBerry calendar using Desktop Manager > Backup/Restore > Advanced. I will try to post a link to free video tutorial on our web site shortly that explains how to delete only the calendar using Desktop Manager.
Here is that link to the video explaining how to delete the calendar - it shows the address book, but same principal applies to calendar:
Video Tutorial by BlackBerry Made Simple
Step 4: IMPORTANT (NOT LISTED ON RIM SITE) After you delete your calendar from your BlackBerry, go ahead and re-sync to your computer.
We have videos on this process for our customers.
Thanks and hope this helps!!
Martin