Hi eyezen,

Don't know if this reply is too late to help, but here goes!

I had the same problem a couple of weeks ago and discovered an executable on our BES at: -
C:\Program Files\Research In Motion\BlackBerry Enterprise Server\GWSystemAddressBookSync.exe
When run it opens a DOS window and the output in that windows suggests that this program forces a GroupWise address book sync.

Hope this helps

BSTMHT