Microsoft has updated their release of the Exchange Server Remote Connectivity Analyzer (BETA). It can run these test for you:
- Microsoft Exchange ActiveSync Test
- Microsoft Exchange ActiveSync Autodiscover Test
- Microsoft Office Outlook 2007 Autodiscover Connectivity Test
- Microsoft Office Outlook 2003 RPC/HTTP Connectivity Test
- Inbound SMTP Email Test
It is a great tool for troubleshooting your Exchange remote access solution: https://www.testexchangeconnectivity.com/