Some calendar entries are missing from my computer after synchronization
If you have more than one calendar on your BlackBerry® device, you see a combined view of these calendar entries on your device by default.
You can only synchronize entries from one calendar on your device to one calendar on your computer at a time. Some entries might be missing from your computer because they belong to a different calendar on your device that is not set up to synchronize with the calendar on your computer.
To change the calendar that is being used on your device for synchronization, change the default services option from one of the following locations: