Starting from Mar 1, Google will start unplugging support of these 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," the company said in a statement on Friday, Jan 29.
After this, Google plans to end support for Google Mail and Google Calendar.
"Starting next 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," the statement released on Friday, Jan 29 added.
However, 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.
This move comes after the search engine behemoth expressed anguish over the vulnerability of IE6 to hacking attacks.
Microsoft has also asked its users to upgrade to IE8.
The 8.5-year-old web browser is disliked by web developers as well.