NEW YORK (MarketWatch) -- Sun Microsystems Inc. java said Friday it'll lay off between 5,000 and 6,000 employees, or 15% to 18% of its work force, in a move to cut costs by $700-$800 million a year. The Santa Clara, Calif. tech firm will take $500 to $600 million in charges over the next 12 months in connection with the plan, of which it expects to incur approximately $375 to $450 million within its current fiscal year 2009. Sun Micro will break up its Software organization into new business groups: Application Platform Software, Systems Platforms, and Cloud Computing & Developer Platforms.