Applies to: Microsoft Office OneNote 2010, Outlook 2010, PowerPoint 2010, Word 2010 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 2010, Outlook 2010, PowerPoint 2010 and OneNote 2010.