It's not a lot of work to get a Windows/IE virtual environment up and running on a Mac, I use Virtualbox daily in combination with https://github.com/xdissent/ievms
This shell script automatically downloads Windows virtual machine images from Microsoft, so that testing can be done in IE6/7/8/9. You don't even need to use separate machines, if you get a Windows 7 virtual machine set up you can use IE Tester to run IE5.5-9 http://www.my-debugbar.com/wiki/IETester/HomePage
This shell script automatically downloads Windows virtual machine images from Microsoft, so that testing can be done in IE6/7/8/9. You don't even need to use separate machines, if you get a Windows 7 virtual machine set up you can use IE Tester to run IE5.5-9 http://www.my-debugbar.com/wiki/IETester/HomePage