IE 9 does not use sub-pixel antialiasing under certain conditions

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Short answer: this is an issue when you specify font sizes in pt (points), rather than pixels.

So what happens is that the new IE9 rendering engine uses DirectWrite, which won’t snap to the nearest pixel as it did with GDI+, so if your pt size doesn’t map to a whole pixel number, it will draw it exactly that way, which makes it appear blurry.

The IE8 compatibility mode wouldn’t suffer this issue as it uses regular GDI rendering that we are used to.

So check out all your style sheets etc and if you are asking for point size font’s, that’s exactly what will be given in IE9, and depending on your font used etc, your point size might or might not map to a crisp and clear size.

This is explained in detail here:

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