While many such security vulnerabilities have been discovered in the past, this one is different because it does not affect only ie but also Firefox.

虽然过去也发现了很多漏洞，但这一次却很特别，因为它不仅影响IE还波及到了Firefox。

youdao

Why, that would be everyone using Windows XP and 2000 because only IE 8 and lower are supported on those operating systems.

FORBES: Another Reason to Get Rid of Internet Explorer

Today, Microsoft has announced new tools and resources to help developers test sites on not only IE 10 (as well as 9) but older versions of browsers.

FORBES: Microsoft Offers Windows 8 Pro and Parallels Desktop For Free

Finally MSN, which only works on IE.

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