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Joshua337

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Is there any legitimate security reasons to upgrade from Internet Explorer 9 to Internet Explorer 11?

I'm trying to determine if there is any legitimate security threat from running Internet Explorer 9 vice Internet Explorer 11. My company is currently using IE9 and I'd like to persuade them to make the change to IE 11. To my knowledge there is not compatibility issue that would require the use of IE9.
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John
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I find too many bugs with older websites that depend on an older version of IE, problems are higher in version 11 and therefore tend to use IE 10. I guess if the website does not work well in 11 you can try running it in compatibility mode.
In terms of straight security, John pretty much hit it on the head - security holes will not be patched in the near future and that will leave you vulnerable.  Already, IE9 is more vulnerable to attack than newer versions.