But Mibbit appeals to a very niche technical community. Gmail's market share is less than 20%, if I recall correctly. A lot of people using IE right now are ei

But Mibbit appeals to a very niche technical community. Gmail's market share is less than 20%, if I recall correctly. A lot of people using IE right now are either forced to use it for corporate purposes - my mother has to use it on her laptop - or they're completely illiterate. If something messes up, they'll see it as Gmail breaking. The solution is graceful degradation, but that won't force people to switch.