Unless they find any strong business case or advantage I don't think a company will agree to spend time on upgrading. What is the use? Also Internet Explorer 6 is little faster than the new versions and business users (who don't care about the version as long as it does the job) may complain.
If you are a developer then you have the reason to have all/latest browsers installed.
I thought mine was the only one to use Internet Explorer 6 ;-)
