Widespread use of MS poses security risk

Well duh. Widespread use of any one product in any market is going to create a likelyhood of a weak link, let alone MS in the computer world. Cashpoints seem to be powered by NT and till in supermarkets and reward card points etc etc, all liable for attack by virii or hackers. Why has it taken everyone so long to realise that MS effectivly has a monopoly on the computer industry? This sint good for the users as it removes competition and a reason for MS to innovate, especially as they can just buy up any rival and immediately remove any need to compete with that company. I suppose its likely that any large group of individuals will gravitate towards one system, but MSs 90%+ market share (pah share thats a joke) is mainly due to their canny IBM-PC link with DOS in the early days. I dont see what can be done in the short term but there definitely needs to be some competition, the only viable ones though are Apple (currently roughly 1.5% of the net) and Linuxs various flavours (currently 0.5% or thereabouts). So how can this huge dominace be altered? Maybe MS can be forced to produce versions of Office for Linux, or reduce the price of Office for Mac. Possibly a better idea would be to force them to open up their code and letter other companies develop Office for Windows and these other OSs, I know Id like a cut down Word (yes I know that TextEdit in Panther opens and saves Word files and Open Office is effectively the whole suite for Linux or OSX under X11). I cant help thinking that MS reminds me of Quark in the DTP industry, I use QuarkXpress and I know fundamently its not as good as InDesign but the difficulties involved in moving to ID are just too much hassle. I also dont really like Adobes UI.