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For all you with any problems or concerns regarding Microsoft Exchange connectivity… You can test your Exchange server services like ActiveSync, Exchange Web services or Outlook connectivity by using: https://www.testexchangeconnectivity.com/ - fresh and new 
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on Monday, June 22nd, 2009 at 10:56 and is filed under MS Exchange server, MS Exchange server 2003, MS Exchange server 2007.
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Testing Exchange Activesync for host https://xxx.com/Microsoft-Server-Activesync/
Exchange Activesync test Failed
Test Steps
Attempting to Resolve the host name xxx.com in DNS.
Host successfully Resolved
Additional Details
IP(s) returned: x.x.x.x
Testing TCP Port 443 on xxx to ensure it is listening/open.
The port was opened successfully.
Testing SSL Certificate for validity.
The SSL Certificate failed one or more certificate validation checks.
Test Steps
Validating certificate name
Successfully validated the certificate name
Additional Details
Found hostname xxxin Certificate Subject Common name
Validating certificate trust for Windows Mobile Devices
Certificate trust validation failed
Additional Details
Certificate chain could not be built. You may be missing required intermediate certificates, See KB 927465 for more details.
You can also use the free AccessMyLan ActiveSync test tool (Windows and iPhone). You wont need to give your username/password to a 3rd party. Download from http://www.accessmylan.com/tools