Hi CKili,
Qdabra's Active Directory Web Service returns all data in Active Directory, so if you have set it up with custom attributes those will be returned as well. You'll have to install the Web Service on a server, but it should work. No code required.
If the data you want does not exist in AD but rather in Exchange, you will need to call Exchange's MAPI interface to get it. That will require code.
Best,