Google has been aggressive about keeping Google Apps owners on the same (web) page. The company's cloud platform typically won't acknowledge any browser more than one version out of date, and it's about to put that rapid upgrade strategy to the test by dropping support for Internet Explorer 8. On November 15th, shortly after IE10 arrives in sync with Windows 8, Google will leave IE8 web app users to fend for themselves -- and, by extension, Windows XP users without an alternative browser. While the cutoff doesn't amount to a full-fledged block, Google Apps users still stuck in 2009 will be reminded that they're on their own until they upgrade. Is it the end of the world for web apps on older PCs? No, but it's clear that their days are numbered.
Microsoft Windows 8
Microsoft Windows XP