Earlier quoted context omitted.
ADP announced deprecation for IE10 and IE11 last year. They apparently didn't realize that Edge doesn't run in Win7 which many of their customers still have deployed, given the issues surrounding Win8 and 10. I guess they can use this as an excuse to not upgrade their shitshow flash app that beings a multi-core processor to it's knees just navigating between entry fields.
The OS upgrade is/was free, and IE11 is nearly 6 years old at this point. There are also other/current browsers available for Windows 7. There's really no excuse to not have a current browser.
ADP has always been awful, I only wish they would get taken out by a competitor.