No. Whether Internet Explorer is your default browser in your organization or not, Ion does not affect your default browser choice. By design, Ion is meant to be used to provide a compatibility experience and should be used when needed rather than as a default setting. Ion itself is not a browser but a management layer that works with the existing Internet Explorer browser; if IE8, IE9, IE10, or IE11 is the default on your system, it can remain so with Ion installed.
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