Effective 1 March 2010, Google will begin phasing out support of older browsers on the Google Docs suite and the Google Sites editor. After that point, certain functionality within these applications may have higher latency and may not work correctly in these older browsers. Later in 2010, Google will start to phase out support for these browsers for Google Mail and Google Calendar.
Google Apps will continue to support Internet Explorer 7.0 and above, Firefox 3.0 and above, Google Chrome 4.0 and above, and Safari 3.0 and above.
Read more at BBC News
Starting this week, users on these older browsers will see a message in Google Docs and the Google Sites editor explaining this change and asking them to upgrade their browser.
We will also alert you again closer to March 1 to remind you of this change. If you have not already upgraded to a new version of your existing browser, now is a good time to do so.