Be careful with that LDAPALPSearch key in KB03193. It seems that with that key enabled, you're basically searching against account names in AD rather than display names. Most searches will return unexpected results (if you're used to the regular MAPI lookups), and the usual "lastname, first" search will return the dreaded "No Results".
If you remove the LDAPALPSearch entry and restart your services, the lookups from the devices should work more predictably.
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