By default the Jabber client will only search for user accounts in the selected OU path under the Service Profile. The default AD search filter is

(&(objectCategory=person)

To enable Jabber to search for contacts and enabled users in Active Directory, modify the base filter to

(&(|(objectclass=user)(objectclass=contact))(!(objectclass=Computer))(!(UserAccountControl:1.2.840.113556.1.4.803:=2)))

Where to apply the Base Filter.

Navigate to the Directory Profile section in the Service Profile. The Service Profile is listed under User Administration -> Users Settings.

Enter the above mentioned filter into the “Base Filter (Only used for Active Directory)” field.

**Updated**
You also have to add the following lines to your jabber-config.xml.

<?xml version=”1.0″ encoding=”utf-8″?>
<config version=”1.0″>
<Directory>
<UseSIPURIToResolveContacts>true</UseSIPURIToResolveContacts>
<SipUri>mail</SipUri>
<UriPrefix>sip:</UriPrefix>
</Directory>
</config>