I create all kinds of notes (using Notepad), little snippets that I might or might not implement, so I forgot where I got this gem but props to the author!
Open index.tpl in your template/customer folder.
Place right after tag:
<!--[if lte IE 7]><div class="notice">You have better choices - Internet Explorer 6 was released <strong>8 years ago</strong> and parts of our Web site will not work on this non-compliant Web browser. For Security, for Compatibility, and for Humanity, please consider these free and better replacements for Internet Explorer: <a href="[URL]http://www.firefox.com[/URL]">Firefox</a>, <a href="[URL]http://www.opera.com/[/URL]">Opera</a>, <a href="[URL]http://www.apple.com/safari/[/URL]">Safari</a> or <a href="[URL]http://www.google.com/chrome[/URL]">Google Chrome</a>. Thank you!</div><![endif]-->
```Add to style.css:<br />
<br />
.notice {margin:5px 0;padding:10px;border:1px solid #dedeb9;background:#ffffd4;text-align:center;}<br />
<br />
You can adjust the CSS to suit your needs but this displays a small notice at the top of your Web pages to encourage complacent people to upgrade their browser. Basically you could use this for anything that needed in-your-face attention.<br />
<br />
NOTICE: I know very little about coding so do not ask me how to implement this outside of the instructions I provided. With my help your site might crash permanently :P