Web font embedding requires new CSS for IE9
Microsoft does not support IE9 anymore, and neither do we.
If you embedded web fonts in the past years (e.g. by copying CSS from a Font Squirrel @font-face kit Show archive.org snapshot ), that CSS won't work in Internet Explorer 9.
You can fix it by turning these styles...
@font-face
font-family: 'MyFont'
src: url('myfont.eot')
src: local("☺"), ('myfont.ttf') format("truetype")
font-weight: normal
font-style: normal
... into these:
@font-face
font-family: 'MyFont'
src: url('myfont.eot')
src: local("☺"), url('myfont.eot?#iefix') format('embedded-opentype'), url('myfont.ttf') format("truetype")
font-weight: normal
font-style: normal
Font Squirrel's @font-face kits come also come with this updated CSS now.