The actual IE for Mac has died long ago and was barely related to IE for Windows anyway. If you mean current versions, try something like Saucelabs interactive sessions. They offer many different OS/browser combinations in VMs and even their free offering is plenty for light use.
https://www.saucelabs.com/ for more...
In more limited form, Microsoft have their own freely downloadable VMs for certain versions of IE, though there are some tricky licensing issues, the VMs expire, and it's all quite cumbersome. http://www.microsoft.com/downloads/en/details.aspx?FamilyId=...
For really basic tests, there's also the IE net renderer at http://ipinfo.info/netrenderer/
