Mr Dalton figured it out yesterday: http://blogs.technet.com/ewan/archive/2009/02/06/custom-presence-states-in-ocs-revisited-again.asp

Between OCS 2007 R2 release candidate and RTM, the custom presence rules changed. You can no longer use the file:// method to specify the XML file to use for setting your custom presence. A long time ago, I posted about custom presence in OCS 2007 R1

Awesome find. Good to know custom presence is still available.

Whilst I’m on the subject of OCS, voice and presence , I noticed that Ewan has updated his document on

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