We would like to remind you of the Google Apps browser support policy, the set of guidelines for Google Apps services interoperability support. Google supports the latest version of Google Chrome (which automatically updates whenever it detects that a new version of the browser is available) as well as the current and prior major release of Firefox, Internet Explorer and Safari on a rolling basis. Each time a new version of one of these browsers is released, Google begins supporting the update and stop supporting the third-oldest version.
Google’s test plans have been adjusted to now stop all testing and engineering work related to Internet Explorer 9 (IE9), as Internet Explorer 11 (IE11) was released on 17 October 2013. End users who access Gmail and other Google Apps services from an unsupported browser will be notified within the next few weeks through an in-product notification message or an interstitial pages with information about modern browsers and how to upgrade to them.
For more information:
https://support.google.com/a/
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