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Linux/Mac support is a definite plus that could be considered even though it works 99.99% in Linux under WINE emulation. (Click here for a guide to running MT4 in Ubuntu Linux)
I believe it could also work that way for Mac OSX since it is also a *nix based OS?
Honestly, I get sick of traders complaining of problems that are caused by viruses. They spend more of their time clearing viruses and malware out than actual trading. Linux and Mac OSX change all that and it's why I prefer trading in Linux rather than windows.