I'd like to introduce you to the Exchange Remote Connectivity Analyzer (ExRCA) tool which can be accessed at https://www.TestExchangeConnectivity.com.
In this version, the tool will allow you to remotely test the following client types and services:
Exchange ActiveSync
- Windows Mobile 5, 3rd party devices
- Windows Mobile 6.1+ with AutoDiscover
Outlook Anywhere (aka RPC/HTTP)
- Outlook 2003
- Outlook 2007 with AutoDiscover
Inbound SMTP
Source : Exchange Team Blog
