Well I can guess this is not everyones light reading but in Microsoft's Earnings statement the Surface RT seems to have been as much a problem for others. So how many tablets does $900 Million buy?
Cost of revenue grew $1.4 billion, or 35%, primarily reflecting product costs associated with Surface and Windows 8, including a charge for Surface RT inventory adjustments of approximately $900 million, higher headcount-related expenses and increased online infrastructure expenses, offset in part by decreased traffic acquisition costs.
http://www.microsoft.com/investor/EarningsAndFinancials/Earnings/PressReleaseAndWebcast/FY13/Q4/default.aspx
Cost of revenue grew $1.4 billion, or 35%, primarily reflecting product costs associated with Surface and Windows 8, including a charge for Surface RT inventory adjustments of approximately $900 million, higher headcount-related expenses and increased online infrastructure expenses, offset in part by decreased traffic acquisition costs.
http://www.microsoft.com/investor/EarningsAndFinancials/Earnings/PressReleaseAndWebcast/FY13/Q4/default.aspx