 Shares rose as high as 3.6 today and finished Wednesday's trading session up nearly 4%. The tech and retail giant is now a member of an elite club of companies that have surpassed the key market capitalization. Americans who phoned the IRS this year saw two-thirds of their calls go unanswered. Taxpayers successfully reached a human about 31% of the time this tax season, according to the agency's own taxpayer advocate.