In the Address Book or Outlook Express, click the Tools menu, and then click Accounts.
If you are in Outlook Express, click the Directory Service tab.
In the Directory Service list, double-click the directory service.
On the Advanced tab, change the information in the Search area as necessary.
For example, if the search connection times out before you get any results, increase the Search time-out value by dragging the bar to the right, and decrease the value in the Maximum number of matches to return box.