Microsoft Office: “Speak” function
Speak is a built-in feature of Word, Outlook, PowerPoint, and OneNote. You can use Speak to have text read aloud in the language of your version of Office.
Text-to-speech (TTS) is the ability of your computer to play back written text as spoken words. Depending upon your configuration and installed TTS engines, you can hear most text that appears on your screen in Word, Outlook, PowerPoint, and OneNote. For example, if you're using the English version of Office, the English TTS engine is automatically installed.