We will recommend you to avoid all-in-one solutions, such as Multiple_IE. How to install multiple IE on the same computer
Therefore, you must keep testing all your websites against newer and older IE versions. That being said, it's possible that IE could get its popularity back. The latest version IE10 even has great HTML5 and CSS3 capabilities and, on some occasions, even beats today's favorite browser, Google Chrome. They are fast, more standard-compliant and they will cause fewer troubles than older versions. Internet Explorer's popularity is decreasing last several years, however, newer versions of this browser, especially 9 and 10 are not bad at all. Even if Microsoft's Internet Explorer is not your favorite browser, you should test your site on it, because many people are still using even older versions of this browser.
