Sun Microsystems will fire up to 5000 workers this year, as the company tries to cut costs and make it easier to post quarterly profits. All told, Sun expects to cleave off between 11 per cent and 13 per cent of its 37500 person workforce. The firings mark the first mass layoff to take place under new CEO Jonathan Schwartz. Sun has historically been reluctant to let go of staff, despite Wall Street’s constant calls to trim costs via layoffs. CNet has more.