Microsoft Internet Explorer was one of the internet's earliest victims to 'meme' culture to where it was long depicted (below) as been a slower alternative to (from left to right) Google Chrome, Mozilla Firefox & finally Safari by Apple.
2. If Microsoft Edge is the new show in town then why does my organisation still use Internet Explorer?
Some of the older systems, databases and networks in your organisation may still depend on Internet Explorer to function. This is not uncommon and it might take some time / resources to update all legacy (older) systems across your organisation that may be dependent on Internet Explorer.
3. How do I update my default browser?
This varies depending on the type of operating system you are using. (Windows, Mac, Linux, etc). To change your default browser please follow the following link.
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Internet Explorer - Technical Information / Notes from Microsoft
Support ended 1/12/16 for Internet Explorer (IE) 10 and older. Security updates, compatibility fixes, and technical support continues for IE 11 on Windows 7, 8.1, and 10.
What is the Lifecycle policy for Internet Explorer (IE 11)?
Microsoft recommends using the new Microsoft Edge as your default browser. Microsoft Edge supports backward compatibility for Internet Explorer 11.
Internet Explorer is a component of the Windows operating system and follows the Lifecycle Policy for the product on which it is installed.
Beginning January 12, 2016, only the most current version of Internet Explorer available for a supported operating system receives technical support and security updates.
Products whose lifecycle ended on or before January 12, 2016, were not impacted and therefore are not represented in the table below:
https://support.microsoft.com/en-us/help/17454/lifecycle-faq-internet-explorer-and-edge