For those of you wanting to test out a new Microsoft tool for Exchange issue diagnosis, go to https://testexchangeconnectivity.com. As the presenter emphatically emphasized at TechEd today, this tool is a prototype and has not been run through the normal battery of security tests. If you want to use this tool, create an account and mailbox specifically for testing purposes, and delete it once you have completed testing. DO NOT use your own Exchange mailbox or any other "production" mailbox with this tool. That being said, check it out, it looks pretty cool.