FILE - This Oct. 4, 2011 file photo, shows the Apple logo during an announcement at Apple headquarters in Cupertino, Calif. Apple's market capitalization topped $500 billion in opening trading Wednesday, Feb. 29, 2012, climbing to a mountain peak where few companies have ventured and none have stayed for long. (AP Photo/Paul Sakuma, File)

Associated Press
FILE - This Oct. 4, 2011 file photo, shows the Apple logo during an announcement at Apple headquarters in Cupertino, Calif. Apple's market capitalization topped $500 billion in opening trading Wednesday, Feb. 29, 2012, climbing to a mountain peak where few companies have ventured and none have stayed for long. (AP Photo/Paul Sakuma, File)
FILE - This Oct. 4, 2011 file photo, shows the Apple logo during an announcement at Apple headquarters in Cupertino, Calif. Apple's market capitalization topped $500 billion in opening trading Wednesday, Feb. 29, 2012, climbing to a mountain peak where few companies have ventured and none have stayed for long. (AP Photo/Paul Sakuma, File)
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