What percentages are you seeing of business users still being forced on IE7? I recently worked with a large bank and they are under almost all the way off of it having everyone on IE8-9 and FF ESR Channel. Like always I hope people are using some form of data analysis to determine if supporting the old browsers are really needed.
I work in a big multinational and the transition to IE8 is not finished.
It doesn't matter if 99% of a company is on IE8. If 1% can't use it, you are still out. Especially when your solution is new and people will not be so open to it from the beginning.
There are entire education systems in China and Korea still using it unfortunately. I'm currently working on an eLearning platform for schools in Asia and we are required by the Ministry of Education to support IE7.
