I'm in the same boat here, but the other way around.
The device has the two Address Books, one is Wireless Sync = Yes (this one has 11 entries, the other Address Book is Wireless Sync = Not Avail (this one has 280 entries)
Outlook went from 280 to 11 contacts. Have backed up the device db's but am, fearful of wiping.
<Insert clever remarks here>