Need Monitor for Exchange 2007 CAS

I need to create a health monitor that will log into the OWA site to test availability of Exchange. The deployment guide lists a generic monitor for IIS. This will not tell us if backend MBX server is actually up.

 

 

Support is no help as they say I will need to pay professional services. I also tried to do something similar with a Citrix CAG.

 

 

Basically I am looking for the proper send and receive strings for the monitor.

 

 

9.4.6 and 2 Exch 2007 CAS servers behind LTMs.

 

 

Thanks