Target IE versions with media queries instead of using a whole separate stylesheet
@supports (-ms-accelerator:true) {
/* IE Edge 12+ CSS styles go here */
}
/*IE10+ */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
/* IE10+ CSS styles go here */
}
/*separate stylesheet for lower */
<!--[if IE]>
<link rel="stylesheet" type="text/css" href="all-ie-only.css" />
<![endif]-->