Assuming your Active Directory server is at 10.0.0.5 and your domain is mydomain.local

Assuming you have created a user named "queryuser" with the "Active Directory Users and Computers" to connect to the directory with (Anonmous queries are not allowed by default)

ldapsearch -Hldap://10.0.0.5 -b "" -s base -x -W -D queryuser@mydomain.local

To test SSL:

ldapsearch -Hldaps://10.0.0.5 -b "" -s base -x -W -D queryuser@mydomain.local

You should see Microsoft Knowledge Base article 321051 ( http://support.microsoft.com/default.aspx?scid=kb;en-us;321051 ) for details about getting SSL configured for queries. 

Be advised if you do not use SSL, password queries will be sent unencrypted across the network.

ldapsearch -Hldap://10.0.0.5 -b "" -s base -x -W -D queryuser@mydomain.local