Sorry for the delay in replying, I was away last week.
Anyway as suggested you could use the Exchange Resource Manager, but depending on your requirements/budget you might want to look at the Microsoft Auto Accept Agent (its free from Microsoft ) the agent can be found here: http://www.microsoft.com/downloads/details.aspx?familyid=3d0884e6-c603-491d-bf57-acf03e046bfe&displaylang=en
Regards
Ben Hoffman
Microsoft MVP - Windows Server System Exchange