This is a bug in upgrading from 2.2 to 4.0, Be sure your 2.2 server is fully patched prior to moving anyone to the 4.0 server.
Second. Upgrade your BB uses to Roaming profiles in Notes. This will allow wireless sync to there personal addressbook in Notes. No need to Sync anymore....
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Dekstop software only good for BB os updates after 4.0 upgrade. Be sure as weel that all users devices are at 4.0 or better.....
Enjoy.