My advise is if you can at all avoid it, to drop support for IE on Macs.
This is because:
- The vendor no longer supports the kit anyway
- Mac users have plenty of other good browsers (which IE is not anyway), including Safari and Mozilla
- Mac IE has SOO MANY lame bugs which are difficult or impossible to work-around, it is almost impossible to support if you are making a fairly rich web application.
Of particular concern is the behaviour of Mac IE crashing as soon as a gnat farts in its general direction.
Mark