The Installation and Administration of Microsoft Exchange solutions, due to their ever growing complexities, require more time and resources. Quite often, mistakes happen.
The Microsoft Exchange Server Team have developed a tool (Exchange Server Remote Connectivity Analyzer), that helps you diagnose problems. The idea came out of customer feedback and support calls placed with the Microsoft Support Hotline. You can use this tool directly over the Web.
In the current version, you can test:
Here is a 6 minute Demo-Video that describes and shows the most important functionality: