In Windows normally we cannot install more than one Internet explorer version at the same time. If we upgrade from Internet explorer 5.5 to Internet explorer 6, we can’t no more see the view of the website in Internet explorer 5.5, for this we need to uninstall the Internet explorer version 6 to rollback to its pervious version. For web designers this will be difficult to test the web developers. Multiple IE is freeware and it is an executable file which has been bundled with IE 3.0, IE 4.01, IE 5.01, IE 5.5 and IE 6.0 into one package. It can be downloaded from here