Microsoft has released a new version of the Exchange Remote Connectivity Analyzer. For those of you not familiar with this site, it is a Web-based tool that helps you troubleshoot connectivity issues. The tool simulates several client logon and mail flow scenarios. When a test fails, many of the errors have troubleshooting tips to assist you in correcting the problem.
Please note, this also has ActiveSync tool to help diagnose Activesync issues… (Which is how I use it…)