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CSS: Simple gradients in Internet Explorer <= 8

As I am sure you all know, Internet Explorer can handle simple gradients. Here is a snippet from Twitter Bootstrap, for example:

filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#e6e6e6', GradientType=0);

However, I saw that some people use two CSS rules (one for IE and 8 and one for IE 8), for example:

filter:progid:DXImageTransform.Microsoft.gradient(GradientType=0, startColorstr='#7fbf4d', endColorstr='#63a62f'); /* For Internet Explorer 5.5 - 7 */
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(GradientType=0, startColorstr='#7fbf4d', endColorstr='#63a62f')"; /* For Internet Explorer 8 */

My question is, is the second rule really necessary? Twitter Bootstrap is thorough enough, but it does not use any "-ms-filter" rules. According to this page , the -ms-filter attribute is an extension for CSS and can be used as a synonym for filter in IE8 standards mode.

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