PHP LDAP query - need to add Exchange fields

Hoping this is an easy question to answer, apologise upfront if this is so basic, but just been put in charge of a PHP app with LDAP interface to M$ Exchange, and trying to figure out how it works. At the moment it works fine and extracts fields like first- and surname, title, department, etc. I need to add the 'office' field, and added it at the end of this filter line: --------------------------------------------------- $filter = "(|(sn=$search[$i]*)(givenname=$search[$i]*)(title=$search[$i]*)(department= $search[$i]*)(office=$search[$i]*))"; ---------------------------------------------------- ...but so far it's not working. I *know* there's data in the 'office' field -- any ideas as to what I'm missing? Thanks a lot in advance, Ben