I used to work in IT at a Fortune 100 manufacturing company. IE versions hung around for a long time because there was a lot of software that was built with onl

I used to work in IT at a Fortune 100 manufacturing company. IE versions hung around for a long time because there was a lot of software that was built with only IE in mind and only received the bare minimum of support. In some cases this was off the shelf software from vendors who had gone out of business. In other cases it was software built in house that would require a complete rewrite to modernize. All of this software was tightly integrated into processes that were critical for the company to operate. While the cost of replacing the old software was a consideration, the biggest concern was the potential disruption to operations. If a software change reduced productivity or even worse caused work to stop entirely, it meant millions in financial impact.