There is a new tool available from Microsoft workshop and labs 🙂 In case you need to test your Exchange setup and troubleshoot routing and connectivity. It works nicely and you can test your Exchange 2003 and 2007 servers.You can test many settings on your Exchange and it gives you good idea where is the problem with your Exchange server. You can now test things like Exchange ActiveSync, AutoDiscover, Outlook Anywhere (RPC/HTTP), and inbound email.It works and it is very cool tool.
So if you have a MS Exchange under your control .. give a try .. The tool can be accessed at this here