But actually making the move . One tricky problem is ensuring support for applications as they move from an old copy of Windows to the new version – and this includes numerous applications that only run on the archaic, insecure Internet Explorer 6 browser.

Believe it or not, IE6 is still more widely used than IE7 and the newest version of Google Chrome, according to . 

IE8 is the most-used browser version, and Microsoft is enticing customers to move to Windows 7 in part by to users of Windows XP.

But IE6 will not go away, both among casual users who haven't gotten around to upgrading and among businesses that rely on IE6 to run old applications.