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Income Taxes:
9 Months Ended
Feb. 29, 2012
Income Taxes:

NOTE 7—Income Taxes:

The effective tax rate was 25.3% and 25.7% for the nine months ended February 29, 2012 and February 28, 2011, respectively. The decrease in the Company’s effective tax rate was primarily driven by a reduction in the effective tax rate on operations outside of the United States as a result of changes in geographical mix of foreign earnings, partially offset by the impact of the retroactive reinstatement of the U.S. federal research and development tax credit in the prior year.

As of February 29, 2012, total gross unrecognized tax benefits, excluding related interest and penalties, were $257 million, $136 million of which would affect the Company’s effective tax rate if recognized in future periods. As of May 31, 2011, total gross unrecognized tax benefits, excluding interest and penalties, were $212 million, $93 million of which would affect the Company’s effective tax rate if recognized in future periods. The gross liability for payment of interest and penalties increased $14 million during the nine months ended February 29, 2012. As of February 29, 2012, accrued interest and penalties related to uncertain tax positions was $105 million (excluding federal benefit).

The Company is subject to taxation primarily in the United States, China and the Netherlands as well as various other state and foreign jurisdictions. The Company has concluded substantially all U.S. federal income tax matters through fiscal year 2009, and is currently under examination by the Internal Revenue Service (“IRS”) for the fiscal 2010 and 2011 tax years. The Company’s major foreign jurisdictions, China and the Netherlands, have concluded substantially all income tax matters through calendar 2001 and fiscal 2005, respectively. The Company estimates that it is reasonably possible that the total gross unrecognized tax benefits could decrease by up to $63 million within the next 12 months as a result of resolutions of global tax examinations and the expiration of applicable statutes of limitations.