2. ACQUISITIONS Acquisition of Sun Microsystems, Inc. On January 26, 2010 we completed our acquisition of Sun Microsystems, Inc., a provider of hardware systems, software and services, by means of a merger of one of our wholly owned subsidiaries with and into Sun such that Sun became a wholly owned subsidiary of Oracle. We acquired Sun to, among other things, expand our product offerings by adding Sun's existing hardware systems business and broadening our software and services offerings. We have included the financial results of Sun in our consolidated financial statements from the date of acquisition. For fiscal 2010, we estimate that Sun's contribution to our total revenues was $2.8 billion, which included allocations of revenues from our software and services businesses that were not separately identifiable due to our integration activities. For fiscal 2010, Sun reduced our operating income by $620 million, which included management's allocations and estimates of revenues and expenses that were not separately identifiable due to our integration activities, intangible asset amortization, restructuring expenses and stock-based compensation expenses. The total purchase price for Sun was approximately $7.3 billion and was comprised of: (in millions, except per share amounts) Acquisition of approximately 757 million shares of outstanding common stock of Sun at $9.50 per share in cash $ 7,196 Fair values of stock options and restricted stock-based awards assumed 99 Total purchase price $ 7,295 The fair values of stock options assumed were estimated using a Black-Scholes-Merton option-pricing model. The fair values of unvested Sun stock options and restricted stock-based awards as they relate to post combination services will be recorded as operating expense over the remaining service periods, while the fair values of vested stock options and restricted stock-based awards, as they relate to pre combination services, are included in the total purchase price. Preliminary Purchase Price Allocation Pursuant to our busin