Hmmm, sounds like you need to speak to a professional.
I have a mac (they are great!!). I use firefox as I was told that it is far superior to Safari.
I know what you mean, hotmail (ie Microsoft, ie PCs!!) does seem to have a lot of issues with macs. My type used to display strangely, and also couldnt use the bold, italcs features etc.
To be honest, I cant remember how I sorted it - oh yes, got a new laptop mac to replace my old one and problem was ok on new machine.
I would call your nearest apple store and book an appointment with an Apple Genious (yes, really!). You can take your computer in, like a clinic, and they will look at your problem and fix it.
I would say this was your best option as phone help is useless in my experience.
Are you near a city? Could you enlist a big strong helper to carry the mac in a box, and drive to an apple store? I know there is one in Glasgow and also London...
Sorry cant give you any direct techi help myself.