I came across a Microsoft page that lists "OCS R2 XMPP Gateway" with a General Availability date of 9/28/09. Very interesting. This would enable for example Google Talk (XMPP) users to instant message (IM) OCS users. Jabber XCP has a "SIP/SIMPLE gateway" as well, but I would assume a Microsoft OCS 2007 R2 XMPP gateway might feature tighter integration.For instance, it might automatically sync the XMPP users with the OCS 2007 contact list, so any users added to the XMPP server are automatically added to the OCS 2007 contact database, which then gets pushed out to all the OCS 2007 Communicator clients. No need to manually add an XMPP contact manually one-at-a-time. Of course, that's just speculation, so we'll have to wait and see what features this XMPP gateway has come 9/28/09!
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NextPlane (www.nextplane.net) Federation Server already provides IM, Presence, multi-user chat federation between OCS 2007, OCS 2007 R2, LCS 2005, Sametime and Jabber, Google Apps, and OpenFire.