Free/Busy between different exchange boxes in different forests

Hi

We have 2 separate exchange servers on 2 different forests.  We want to share free/busy information between the 2 forests so users are aware of other forest users' schedule when creating meetings in outlook.

 

I read that Interorg replication tool can be used but....

 

1. We need a tool such as FIM 2010 OR MIIS 2003 to create contacts on opposite forest FIRST?

OR

2. Interorg replication tool is stand alone and will take care of everything without the need for an indentity management package.

 

Thanks

 

Source: http://social.technet.microsoft.com/Forums/en-US/exchangesvrdeploy/thread/c65a98cb-f45c-4c9a-989e-4fb9bbdc66cf

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