OS X Lion machines will continually query Active Directory 2008 for every user in the directory

Question

We are having a problem where our OS X Lion machines will continually query Active Directory 2008 for every user in the directory until a user logs into the machine. When a user logs into the machine, the continuous, expensive queries stop. The problem queries start again as soon as the user logs out. This is a significant load on the domain controllers (DCs) and triggers Field Engineering 5 events on the DCs. We do not use OS X Server Lion.