Unified Messaging “Play-On-Phone” feature is now exposed through Exchange Web Services in Exchange Server 2010 described in EWS schema and WSDL files. What’ll be of more interest to you’s that Play-on-Phone feature’s available in EWS Managed API 1.0. Now you can create custom applications that can read your mailbox items to you on your phone. EWS Managed API implementation’s very straightforward. Additionally, if you plan to handle XML in your code, EWS XML is also intuitive for customers who want to construct XML with Microsoft .NET, Java, a scripting language, or any other language that can send and receive HTTP messages. Example here shows EWS Managed API code that requests that an item be played on a phone, gets status of phone call, and then disconnects phone call. For more information about Outlook Voice Access, see Getting Started with Outlook Voice Access.