Unified communication system for consolidating different message sources (e.g. emails, SMS, voice message, fax, text messages etc.) into a single accessible location with the ability to incorporate phone calls, VoIP calls, voice commands, etc. This is achieved through integration of a Speech-ready IVR system with an E-mail client to act as the Unified Communication System. Furthermore, the IVR flexibility allows the user to access messages when internet access is not available or read messages such as SMS and emails when not physically convenient e.g. when user is driving. System further includes the ability to automatically convert format of sent messages into an alternative format based upon failed delivery attempts or requested message format not being supported. Automatic format conversion of the sent messages are determined by requested recipient targeted format. Users may customize which alternative formats to use based upon recipient targeted format.