User listed in Client GAB, but not in OWA. In the Client, if you type 'johnson' in GAB all the 'johnson's appear. In OWA, if you type 'johnson' in display name field, only a select number of 'johnson's appear. In OWA, if you type 'johnson' in the last name field, more names appear than when the display name field was used, but the specific individual being searched for is not included in the list. In OWA, if you type the last name 'johnson' and the first few letters of the first name, the name appears in the resulting list. In OWA, if you type 'johnson, me' in the display name field, the name appears in the resulting list. How come the name is omitted from the lists when only the last name is entered in either the display name field or the last name field?