When I design a LDAP structure of my company, I use posixAccount and posixGroup objectClasses to store user's account information. I also use inetOrgPerson schema to make LDAP be an address book of my company. Users can be authenticated by LDAP and searched by MUA,such as Outlook and Mozilla Mail. But....How do I mail to a special group of users ?!!

For example, I created a posix group called secretary and I used memberUid to specify which user belongs to it. When I use Outlook's Address book to search the secretary group, I get nothing of the result. But things is different in Exchange. I can get the group's name and mail to all users in this group, when I search the group in Address Book.