I am new on Blackberry (the best phone I ever have -9700 bold ) and I have this problem.
I can not sync calendar because Blackberry Desktop Software say "turn off wireless sync"
In OS 5.0 this probably works, but in 6.0 I can not find the appropriate menu :
In 5.00 ->
Turn off wireless synchronization
To synchronize your organizer data, you must turn off wireless synchronization for each type of organizer data that you want to synchronize using the BlackBerry® Desktop Software.

On your BlackBerry® device, in the Calendar application, Contacts application, Tasks application, or MemoPad, press the Menu key > Options.
If necessary, click a calendar or contact list.
Change the Wireless Synchronization field to No or clear the Wireless Synchronization check box.
Press the Menu key > Save.

Sorry for english.
Google translate the best friend

On your e-mail or BIS settings, you have calendar checked which seems like a G-Mail acct. If you want to use the Desktop manager, uncheck that box

Thanks for reponse.

I have gmail adress.
It was checked in BIS settings. In Gmail i don't see anything about sync.
I uncheck in BIS but nothing hapened.
Still not working.