Unified Messaging is now considered a component or sub feature of the voice-related features that are offered in Exchange 2013. However, new features have been added and there have been architectural changes. The Unified Messaging feature set in Exchange 2013 is similar to previous versions of Exchange. Unified Messaging (UM) was first introduced in Microsoft Exchange Server 2007 and was also available in Exchange 2010. It uses the Exchange store for both email and voice messages. Unified Messaging makes it possible for Exchange administrators to combine voice messaging and email messaging into one mailbox so their users can listen to their voice mail messages in their Inbox or by using Outlook Voice Access from any telephone. Voice mail and email are located in separate inboxes that are hosted on separate servers accessed through the desktop for email and through the telephone for voice mail. Today, IT administrators frequently manage the voice mail or telephony networks and the email systems or data networks for their organizations as separate systems. You have control over how users place outgoing calls from UM, and the experience people have when they call in to your organization. Users can listen to their messages from their email Inbox or by using Outlook Voice Access from any telephone. UM combines voice messaging and email messaging into one mailbox that can be accessed from many different devices. Unified Messaging (UM) enables users to use voice mail and other features, including Outlook Voice Access and Call Answering Rules. Applies to: Exchange Server 2013, Exchange Server 2016