google apps start abandoning old browsers

From coming 1st august,google is starting to abandon old browsers.The definition of old browsers include anything more than three versions old and the list will be a rolling list,updating each time a new version of the browser is released.Its true for safari,chrome,internet explorer and firefox.
From their blog--

For web applications to spring even farther ahead of traditional software, our teams need to make use of new capabilities available in modern browsers. For example, desktop notifications for Gmail and drag-and-drop file upload in Google Docs require advanced browsers that support HTML5. Older browsers just don’t have the chops to provide you with the same high-quality experience.

As of August 1st, we will discontinue support for the following browsers and their predecessors: Firefox 3.5, Internet Explorer 7, and Safari 3. In these older browsers you may have trouble using certain features in Gmail, Google Calendar, Google Talk, Google Docs and Google Sites, and eventually these apps may stop working entirely.