Explorer 11 is currently incompatibile with People Soft, Faculty Center at Maricopa Community College District. Explorer 11 updated automatically on my home machine during the week we entered final grades. I was dismayed to discover, and at least glad, that only Firefox works. The specific problem is that Explorer 11 does not allow faculty to withdraw students. We have never been able to use Chrome for entering grades, although it was promised for December.  We'll see!