We are currently running outlook 2k3 on with exchange and one user called me today regarding their contacts showing up double. When they go to create a new message and select the "To" button to bring up their contacts the people in there are showing up twice. I checked the contacts section of outlook and the names only appear once in there.
Somewhere between the contacts and the address book selection something is causing the names to appear twice. I am not sure what is going on here.