[adrr]

They need to support these newer browsers on older operating systems. If the OS is still being actively patched, new browsers should be made backwards compatible to work on it otherwise we'll have exact same problem with IE8 on XP and IE9 on Vista. And soon to be IE10 on Windows 7.

[camus]

Their business model is to sell os , MSFT never did anything for free.

[pjmlp]

Like all vendors that depend on direct software sales.