With the exception of the default Global Address List, you can
delete offline address lists if you do not want them to be
available for download.
You can change the name of an offline address list you have
created. Use a descriptive name to describe the collection of
address lists in the offline address list. This is the name your
users see when they select offline address lists.
On the Start menu, point to
Programs, point to Microsoft Exchange, and then click
System Manager.
In the console tree, double-click Recipients, and then
click Offline Address Lists.
To delete an offline address list, in the details pane,
right-click the offline address list you want to delete, and then
click Delete.
To rename an offline address list, in the details pane,
right-click the offline address list you want to rename, and then
click Rename. Type the new name for the offline address
list.