A mail I got two days ago started out like this:

"Hello Mr. $myLastname,

I know the Internet Explorer is quite old but we found some errors[...]"

My mind: "NooooOOoOOOO"

They find a lot of weird stuff too, dropdowns, carousels all that major stuff didn't work.

Turns out it was a bug with bootstrap 4.1.0. It's fixed in 4.1.1 and until, release we can use 4.0 just fine.

My feelings in those 15 minutes resemble a sine wave.