Internet Explorer is Microsoft’s classic web browser, originally released way back in 1995. It was popular web browser for internet users then but gradually dying a slow death. For years now it has not been updated to support new web standards used in web design and development and could have security implications if used further. On the other side many web browsers like Chrome or Firefox have already overtaken for good reasons.
The warning of using Internet Explorer as default browser comes interestingly directly from Microsoft itself. The main reason has been stated as something called “Technical Debt”. Internet Explorer was optimized for simplicity at the expense of technical debt. In addition, IE has not been updated to support new web standards. Microsoft calls Internet Explorer “a compatibility solution”, rather than a web browser. The company also added, “As new apps are coming out with greater frequency, what we want to help you do is avoid having to miss out on a progressively larger portion of the web”.
While Microsoft doesn’t openly spread this piece of information in a wider scale, but it’s pretty clear that the tech giant wants to leave Internet Explorer where it should be, in the past and encourages users to upgrade to the modern browser.