Mitel Messaging Server provides a powerful messaging application to organizations with various levels of messaging sophistication for individual user groups. The system can provide voicemail for the most basic of users and integrated messaging for those who wish to view all messages (voice, fax, email) in one place via their email client. Unified messaging is provided for those users who require advanced messaging management and remote access to all messages. Text-to-speech (TTS) allows the listening of emails over the phone and web client provides remote access via a user friendly GUI.

Speech auto-attendant is also available on Mitel Messaging Server, to provide callers and quick and easy routing to company employees, departments and services. When used as both an internal directory and for external callers who frequently contact your business, speech access can significantly reduce the number of "dial 0" calls made to operators, thus reducing your operating costs.