It is wrong to support old browsers because it makes wikipedia maintainance more crufty and difficult.
Theres 3 main cases where someone has an old browser:
They are in the first world environment: 1) are completely clueless 2) are part of the digital divide (eg old, and hence somewhat clueless) or 3)They are in the third world.
The majority of people in the first world are not those who we need care about whatsoever, as its very easy for them to seek out help (remember, linux is free, get a live CD; boot it, run wikipedia...)
Third world however, is the most important area to focus on.
Now, the ONLY reason these people are running an old browser is because they are running windows.
Thus, we should tell them to run linux. Its the ONLY viable solution for running an up to date OS on legacy hardware.
Now, if they have internet connection, i dont care where they are, they are within physical distance of someone with more of a brain than they have (namely the ISP staff). Either one of these people will be able to install linux.
You see, these 3rd world herd humans that are not able to figure out how to run something other than NS3/IE2.0 ... were somehow able to figure out how to get a windows box. Thus, we know that they arent incapable of doing ...things.
Thus, if they breath, and are poor we advise them to run linux. its better for us, and it will domino be better for them and then us...and so forth.
this really isnt worth discussion: rectify quietly and efficiently.
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