Did you select the option to "apply current layout's data formatting to exported data"?
Does Excel support showing text formatted with strike throughs?
yes, I did apply "current layout's data formatting to exported data" and it still took out the strikethrough when exported to excel.
excel does support strike throughs
read somewhere about using GetAsCSS, but don't know how to apply it.
Don't know if that would work (haven't tried it), but you would define a calculation field with GetAsCSS ( your field here ) as its expression and then you would export the calculation field in place of the original field.