[royce]

If someone is developing web applications in such a way that they need support from their browser vendor to make them work properly ... they're doing it wrong.

[Spivak]

I was assuming that the upgrade was more of an IT thing, that all the company computers are now on IE11.

[GordonS]

Yes, that's correct.

We have a portfolio of hundreds of applications, and needed to make sure every one worked OK on IE 11 before upgrading from IE 9.