As sad as it may be, IE6 and IE7 are still the most prominent browsers used by corporate America. If you are building b2b apps you must be conscious of these antiquated beasts.
Best of luck in your freelance endeavors!
EDIT: I have found this tool to be pretty useful in testing against various versions of IE, IETester http://goo.gl/4Egz9
As sad as it may be, IE6 and IE7 are still the most prominent browsers used by corporate America. If you are building b2b apps you must be conscious of these antiquated beasts.
Best of luck in your freelance endeavors!
EDIT: I have found this tool to be pretty useful in testing against various versions of IE, IETester http://goo.gl/4Egz9