Outlook 2010 + Lync with OCS R2 backend, what happened to my conferencing add-in?

It would be a real shame if I couldn’t schedule on premise conferences any more… so here is what you need to do to fix it - change these reg keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Communicator\W13AddinSwitch = 0
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Communicator\W13AddinSwitch =0
Here is a reg file to enable OCS 2007 R2 and the conferencing add-in for it.

Restart Lync and Outlook and hey presto: