The device must be able to resolve to the Exchange Web Services URL and connect to it using HTTP or HTTPS.

If HTTPS is enabled, the certificate must be trusted by the device.
  • Communicator Phone Edition tries to connects to the Exchange Server 2007 Autodiscover service in the following order:

    • https://<SMTP domain>/autodiscover/autodiscover.xml

    • https://autodiscover.<SMTP domain>/autodiscover/autodiscover.xml

    • http -> https redirect

  • On successful response, Communicator Phone Edition connects to the Exchange Web Service URL in the Autodiscover response XML.

  • The certificate from Exchange Server 2007 must be trusted.