IE6/7 understand inline-blocks on inline elements but not on block elements. For block elements you just need to set the element to display:inline and then apply a haslayout trigger for inline elements (such as zoom or strangely enough display:inline-block).
However you can’t apply display:inline and display:inline-block in the same rule as they cancel each other out
You need first to declare display:inline-block and then subsequently declare display:inline.
.column-grid li{display:inline-block}
*+html .column-grid li{display:inline}/* ie7 inline block fix - keep separate from other rules and follow original - not before it*/
* html .column-grid li{display:inline}/* ie6 inline-block fix - keep separate from other rules/
You can’t do this in your inline styles so remove your inline styles to an external class.