Mark found this the other day. I’ve got screenshots now. If you have CWA installed all you need to do is download and install the client. From a company called Modality Systems. Check more here.
I have some customers testing now. They are able to find contacts in OCS, can do Multiple IM conversations at once (see middle screen), you can also manage your presence status and control multiple channels of communications. Nice to see other clients for OCS.