We used to have to test website changes for Internet Explorer 6 because many businesses continued to use it, believing that it was safer to stay several versions behind the current version of Internet Explorer. However, Internet Explorer 6 used non-standard conventions and had numerous security holes, creating serious risk for its users.
Many businesses express hesitation when it comes to upgrading to the latest version of a software. The decision to use newer versions must be taken on a case-by-case basis, as sometimes refusing to use the newer versions causes problems and other times it's in the best interest of the site owner. For the past year and a half, businesses have had a similar choice with Joomla, specifically choosing between Joomla 2.5 and 3. So which should you choose?