Updated answer: Hiding the icon with CSS is even easier: fooobar.com/questions/343963 / ...
Original answer:
It doesn't seem that there is a meta tag to disable the plugin.
Through a trial version and an error, I found that MS Lync does not recognize an inextricable hyphen. Therefore, I wrote a jQuery plugin to replace hyphens in phone numbers with the unbreakable character symbol # 8209. The MS Lync IE plugin starts after javascript is completed, so it will not see the phone number and will not add an icon.
More details in my blog or just look at the code:
jQuery.fn.disableMSLync = function() { return this.each(function(){ this.innerHTML = this.innerHTML.replace(/-/g,"‑"); }) }
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