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The Exchange Remote Connectivity Analyzer is a free cloud based tool that helps Exchange system administrators test:

• Exchange ActiveSync
• ActiveSync AutoDiscover
• Exchange Web Services
• Outlook Anywhere (RPC over HTTP)
• Outlook AutoDiscover
• Internet SMTP Email

This was previously in beta, the final version is available at https://www.testexchangeconnectivity.com/

New/updated features include:

• Updated user interface
• New CAPTCHA implementation. (This is the hard to read words that make you prove you are a human)
• No more ‘Beta’ label
• Additional tests
  – Exchange Web Services – This allows you to perform connectivity testing for Exchange Web Services client such as Entourage. Developers can also use the Service Account Verification test to ensure things are configured and working properly for access with an alternate account or ExchangeImpersonation.
  – Outbound SMTP – Performs Reverse DNS testing, DNS RBL Checks, and SenderID validation against a provided “outbound” IP address
• Updated the Outlook Anywhere test logic to work with Exchange 2010
• Added a link in the footer to the Remote Connectivity Analyzer TechNet forum
• Added a password confirmation text box to ensure the proper password was entered before running a test. This will reduce the number of tests that fail simply due to a typo in the password.

Source: here