The system requirements for using Yahoo! Voice with Yahoo! Messenger are:

• Windows 2000, XP or Vista
• Pentium-class processor (1.0GHz or higher)
• Internet Explorer (version 6.0 or later)
• At least 256MB RAM
• A microphone, sound card, and speakers
• A non-proxy connection to the Internet

A broadband Internet connection is recommended, though not necessary.