If you installed Microsoft Office 2010 Beta as I did, you will find that it does not integrate well with Communicator 2007 R2 and the Live Meeting Add-in does not work either. To fix those problems, you need the following two updates:

1. Office 2010 Beta Integration with Communicator R2 & the Live Meeting Add-In

2. January 2010 Updates for Communicator 2007 R2 and OCS 2007 R2

Once you have the above two updates installed, you should be able to use Outlook 2010 Beta to schedule Live Meeting and Conference Call.

However, due to a confirmed integration error between OCO 2007 R2 and Outlook x64, you may get an Exchange Connection Error in Communicator like this:

I hope this error will be fixed soon.