Unified Messaging Systems provide a place where enterprise data communications are centralized. UMS handles the integration and unification of voice mail, e-mail, SMS, MMS, and fax information. Many unified messaging systems deliver the various messages in the form of e-mails and e-mail attachments. These can be accessed through a user interface such as a browser or an e-mail client. They can be read from a stationary computer and mobile devices such as smart phones, laptops and tablets.