IE has also fallen behind in its support of Mac OS X features. It also doesn't support tabbed browsing, the ability to have multiple Web pages open in a single window.
For instance, IE is the only Mac browser without the capability to block pop-up windows. Microsoft hasn't produced a major upgrade in years, and IE now lacks must-have features that are common in other browsers. Before Microsoft announced that Internet Explorer 5.2.3 would be the last OS X version, the venerable winner of 1990's browser war was already showing its age.
