HAd a similar problem but with only 1 calendar.
Somehow the BB created a second calendar and moved all the appointments to that calendar which did not sync with Outlook
After many hours the following solved my problem
Make a backup of your phone just in case
make a backup of your pst files in outlook
Wipe your phone completely options ->security options->general settings->menu ->wipe handheld
This wipes out your handheld device
now restore the backup but disable the claendar backup in the options section on desktop manager - your BB should be back to normal but no calendars
Now set up your sync manager for a one way sync from outlook to the BB
This should reinstate your calendar
If you are happy do another backup (new name for safety)
Then do a two way sync and there should be no changes
Hopefully this will help you - took me about 8 hours to get this right
Hope it works for the multiple calendars though as i only had 1 calendar
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