BDuns - 11:32 pm on Apr 6, 2007 (gmt 0)
If you have two different customers, they need separate account for everything. If dupe kw's are in the same account, only one ad will show at a time. If the customers are competing against each other, they'll get bent when they realize the other guy's ad shows but not theirs. Also, google lets you, but MSN and Yahoo get rid of duplicate kw's anyway.