Check out the Exchange Server Remote Connectivity Analyzer Beta
Want an easy way to check if AutoDiscover is working? Not sure if Exchange ActiveSync is configured correctly? Need to test your inbound mail flow? For help with these questions, and more, check out the Exchange Server Remote Connectivity Analyzer. This newly announced tool, nicknamed ExRCA, is a free Web-based test tool developed internally by Shawn McGrath and Brad Hughes.
Shawn and Brad announced the tool on the Exchange team blog.
You can check out ExRCA, which is currently in Beta, at https://www.testexchangeconnectivity.com. You can also follow ExRCA on Twitter and also join the ExRCA Facebook group.