With Microsoft's push to get users on Windows 10 and thus using it's latest Edge browser, the company announced changes in its support policy for IE from 12 January 2016 so that only the most recent version of IE available for each supported operating system will receive technical support and security updates.
Microsoft indicated this change of policy before, but with the end of 2015 now rapidly approaching, Microsoft has reiterated its advice to upgrade to the most recent version of IE available for the OS being run.
This means IE 11 for the majority of Windows users. The exceptions are Windows Vista SP2 and Windows Server 2008 SP2, for which the latest available version is IE 9, and Windows Server 2012, for which the latest available version is IE 10.
The reminder is most pertinent to those running Windows 7, which is still the most widely used version of the platform and which pre-dates IE 11. Upgrading the browser is typically of little consequence for consumers, but may have implications for businesses if applications they rely on have been developed to work with specific versions of IE.
Of course MultiBrowser's standalone IE browsers will still enable businesses that need to run specific web applications using specific browsers to do so. Developers can use the standalone browsers to test for compatibility of those applications, or if version specific is not required the a user can use the compatibility mode that is included in Edge and IE11.
Microsoft's announcement here