Internet Explorer 7, 8, 9, and 10 have their days numbered. Come January 12, only Internet Explorer 11 will be supported on modern Windows desktop operating systems, along with Edge on Windows 10. IE 9 in Vista SP2 does gets a stay of execution, but not for long—that operating system will be taken behind the barn in April 2017.
The situation is slightly different for server versions of Windows. Microsoft will only offer support for IE 11 on Windows Server 2012 R2 and 2008 R2 SP1, but IE 10 will continue to be supported on Windows Server 2012. Internet Explorer 9 on Windows Server 2008 will still have support, too.
Most systems administrators and company IT folks know all too well about ActiveX and IE-only software. For companies (still) relying on older versions of Internet Explorer, Microsoft recommends the use of Internet Explorer 11's Enterprise Mode. In the company's own words:
In order to ease the migration of applications to current web standards, Enterprise Mode for Internet Explorer 11, released in April 2014, offers better backward compatibility and enables customers to run many legacy web applications once they upgrade to a more modern browser. To help customers who have a business need for using Internet Explorer 11 with Enterprise Mode, Microsoft is committed to supporting Enterprise Mode through the duration of the operating system's support lifecycle and to continuing to improve Enterprise Mode backward compatibility,
As a jaded web developer myself, I have no other words about this Internet Explorer cull except "good riddance."