Netscape Navigator versions 4.05 and earlier and Microsoft Internet Explorer 4.01 and 4.5 for Macintosh include a security component that expired at the end of 1999.

If you do nothing, you may see a warning message when accessing secure parts of the Yahoo! site after December 31, 1999. The message may state that the certificate used to protect the transmitted information has expired.

The SSL connection between the Yahoo! servers and your browser will be as secure as before. This is not a security risk.

To address this issue, you can do one of two things:

Click past the warning

This warning is just an alert. You can click "Continue" to pass it, however, you'll continue to receive the warning message whenever you attempt to access a site using SSL encryption.

Upgrade your browser

Download a new version of Microsoft Internet Explorer for Macintosh or Netscape Communicator. The new versions of these browsers have updated CA certificates that do not expire on December 31, 1999.

More details from Verisign.