Search giant Google said that it will phase out support for older versions of browsers.

The reason, it said, is because "old browsers" can't run new features available on the web effectively.

It is advising people to move to IE 7 or above, Firefox 3 or above, Google Chrome 4 or above and Safari 3 or grater.

Google will start to phase out support for Google Docs and Google Sites, and says that after March 1, some functionality won't work properly in older browsers.

"Please take the time to switch your organisation to the most up-to-date browsers available," it said  on the Google Enterprise blog.