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Go to [browsers.evolt.org...] for earlier flavors of most browsers and see this WW thread [webmasterworld.com...] for how to install multiple versions of IE.
A big advantage is that once the partitions are set up and the OS's installed you can download browsers to your hearts content knowing that if anything goes wrong you are only going to screw up one partition. Just keep one partition for your main system and never download anything to it unless tested elswhere. My system has been running over a year without a problem.