What should we make of HP CEO Leo Apotheker’s recent announcement that HP is spinning off its PC business for a future sale, despite holding worldwide market share leadership? Here are three potential answers. HP understands portfolio management. The PC industry as traditionally defined is maturing, with growth mostly in the developing world. HP has higher growth businesses in which to invest. Apotheker’s copying another company’s winning strategy. In 2005, IBM sold its PC business to Lenovo to focus on its Smarter Planet B2B solutions business. HP’s recent announcement that it is buying British enterprise software maker Autonomy Corporation at a 60-80% premium (depending on the analyst) suggests a copycat strategy. Autonomy provides unstructured data analytics and data management software, positioning HP for the $20 billion enterprise information management market and $55 billion business analytics software and services market. HP can’t compete. Computing…