Voicemail preview is a feature of unified messaging, and in particular voice-to-text messaging programs such as Microsoft Exchange. When voicemail preview is enabled, users can see a short summary of each message's contents, so that the messages can be quickly screened.
A voicemail preview provides enough information for the user to tell what a message is about, without having to read (or listen to) the entire message. This feature is especially convenient when the inbox contains a large number of messages, or the when user has limited time and must triage the messages. The voicemail preview function works best when callers speak loud and clear in plain language, with a minimum of background noise, and without a heavy accent. The maximum allowable message length for previewing in Microsoft Exchange is 90 seconds.