We migrated from Exchange 2003 to Exchange 2010 last year. I had set up custom address lists that were available after the move and, I'm sure, were updated as changes were applied even after the conversion. Over time, the updates took longer to be available and often never did show up. I finally found the correct steps and converted the 2003 address lists to 2010, but I still see two different copies one of the address lists.
One shows up in the address book view under Microsoft Exchange and the other shows up under Microsoft Exchange/All Address Lists. The latter is the one that updates correctly. How do I get rid of the other address list that is shown under the address book root of Microsoft Exchange?