The following is from Microsoft's public announcement:
While OnePacs will remain compatible with IE 8+ in the short term, we recommend the upgrade to IE 11 or other supported browser that will receive security and stability updates. Using a browser with up-to-date security patches may be an organizational or regulatory requirement depending on the requirements that your organization is subject to. If you plan on using an out-of-date version of Internet Explorer it is recommended that you consult with your compliance officer to determine whether the use of a potentially insecure browser is permissible.Internet Explorer 11 is the last version of Internet Explorer, and will continue to receive security updates, compatibility fixes, and technical support on Windows 7, Windows 8.1, and Windows 10.
https://www.microsoft.com/en-us/Windows ... IE-support