I can't seem to get our OWA to work on our Macs.  We have four of them and none of them are able to access OWA.  All of our PCs work just fine.  It doesn't seem to matter what browser is used.  Is there a Mac setting that is stopping them from being able to access OWA?  The message I get is that site is unavailable or some similar version of that depending on the the browser I use.