You think using Apple iTunes on your legacy system (in this case Oracle Beehive) to sync contacts will result in no problems (because Apple has such high quality (yes, this is sarcasm) software in the Windows world.....). But when you migrate into Exchange some contacts are duplicated.
But you migrate and you get some duplicate contacts. Not from ALL users, just the ones using iTunes.
Yep. That happened in a real world site this past weekend.
Use this procdure post-migration to de-dupe:
This is from: