An image from Yahoo Finance, showing Rackspace’s stock performance over the last six months (WEB HOST INDUSTRY REVIEW) — In its fourth quarter earnings report, released this week, managed hosting provider Rackspace ( www.rackspace.com ) revealed that its chief financial officer Bruce Knooihuizen plans to retire, though he says he will stay with the company until a replacement has been found. The company said it would conduct an extensive internal and external search to replace the 55-year-old Knooihuizen, who joined the company as CFO in 2008. In its report for the period from October to December of 2010, Rackspace reported $13.5 million in earnings, or 10 cents per share, down from $30.2 million and 24 cents per share a year ago.