My company is evaluating Office 365 which comes with hosted Exchange and Lync. The lync client does not support any other IM services. We currently use AIM and Yahoo messenger heavily and would like some type of interoperability without needing to run two separate IM clients. Is there a 3rd party client that will support AIM, Yahoo and Lync? We currently use Pidgin which supports both AIM and Yahoo but does not appear to support Lync.