I got my hands dirty with ActiveSync two weeks back (http://mobilitydojo.net/2010/03/17/digging-into-the-exchange-activesync-protocol), and shared the results with you here. I also mentioned that doing the things I did required a few lines of code since not everything could be done in Fiddler. Because of this I promised you I had something in the works to let you actually play around too, without cracking open your Visual Studio, and now I’m trying to make good on this promise
I introduce to you, the first beta release of “Exchange ActiveSync MD”. It is a desktop app that will let you emulate a device connecting to ActiveSync. Yes, it is similar to what www.testexchangeconnectivity.com, but I only focus on EAS, and I have a couple of options not present in the ActiveSync test MSFT provide. It will require you to have .Net 3.5 installed on your computer – I’ve tested it running on Windows 7 and Windows Server 2008 R2, but it should work on other Windows versions too with .Net present. It will not require an installation, and you can just run the .exe file itself.
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ActiveSync diagnostic utility

