SAPI 4 voices are only available on Windows 2000 and later Windows NT-based operating systems. There are both SAPI 4 and SAPI 5 versions of these text-to-speech voices. Michael and Michelle are also optional male and female voices licensed by Microsoft from Lernout & Hauspie, and available through Microsoft Office XP and Microsoft Office 2003 or Microsoft Reader.
Microsoft Mike and Microsoft Mary are optional male and female voices respectively, available for download from the Microsoft website. It is used by Narrator, the screen reader program built into the operating system.
Microsoft Sam is the default text-to-speech male voice in Microsoft Windows 2000 and Windows XP.
