Since chat is just a new, free part of the new Yahoo! Mail, its system requirements are the same.

Chat in the all-new Yahoo! Mail with:

• IE 6.0 thru IE 7.0
• Firefox 1.5 and newer
• Mozilla Suite 1.7
• Netscape 7.2

Operating Systems Supported:

• Windows 2000, XP or later
• Mac OSX or later

To chat in Mail, Adobe Flash Player 7 or higher is also required – Adobe Flash Player 8 or higher if you’d like the chat sound alerts to work. The good news is that your browser’s probably already equipped with one of these versions. Click here to check what you’ve got!

If you need a newer version, you can download and install the latest Flash Player here.