Exchange 2010 provisioning via FIM 2010

Experts,

We are using FIM 2010 R2 for AD provisioning in our environment which is running completely fine. All provisioning is codeless and through outbound synch rule to AD.

Now we want to enable exchange provisioning. I have been going through couple of links and getting one doubt.

do I have to necessarily select 'Enable Metaverse Rule Extension' and select file 'Exch2010Extenstion.dll' although I am having codeless provisioning so far?

Thanks,

Mann