TL;DR; Explains how IE8’s Compatibility View lets users easily switch to IE7 mode for better website display, with the feature appearing only on certain sites.

If you were worried about your pages viewing correctly in IE8 Beta 1 you had to restart your browser to enable “IE7 Compatibility mode”. Now it is easy:
Although it seams to do a bit of detecting and only displays it on certain sites.
For example Microsoft.com and Google.com do not get the little button.
But Gmail does :)
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