LDAP client library
• Get a list of all users
• Get a list of all groups
• Get a list of all users in a group (or groups of a user)
• Get user’s properties (e.g. full name or e-mail address)
• Authenticate a user (by user name and password)
Tommy Andersen commented
I checked if Rebex had this support a couple of months ago but I ended up using .NET's LDAP support which is really powerfull and easy to use.