<p style="line-height: 20.8px;">Starboard Value, an activist investing firm that owns a stake in Yahoo, wrote a scathing letter Wednesday to Mayer, Yahoo chairman Maynard Webb and the rest of the company&#39;s board.</p> <p style="line-height: 20.8px;">He added that &quot;to be successful, dramatically different thinking is required, together with significant changes across all aspects of the business starting at the board level, and including executive leadership.&quot;</p> <p style="line-height: 20.8px;">This is not the first time that Smith has attacked Yahoo. He has written several letters to Yahoo since Starboard first acquired a stake in the struggling Internet company in the third quarter of 2014.</p>