and certain other employees, stock-based compensation expenses, integration related professional services, certain business combination adjustments including certain adjustments after the measurement period has ended and certain other operating items, net. Stock-based compensation expenses included in acquisition related and other expenses resulted from unvested stock options and restricted stock-based awards assumed from acquisitions whereby vesting was accelerated upon termination of the employees pursuant to the original terms of those stock options and restricted stock-based awards.

Fiscal 2014 Compared to Fiscal 2013:     On a constant currency basis, the increase in our acquisition related and other expenses in fiscal 2014 was primarily due to certain benefits that we recorded during fiscal 2013, which reduced our expenses during this period. We recorded a net benefit of $387 million during fiscal 2013 related to the change in fair value of contingent consideration payable in connection with an acquisition (see Note 2 of Notes to Consolidated Financial Statements included elsewhere in this Annual Report). We also recorded a $306 million benefit in fiscal 2013 to professional fees and other, net related to certain litigation (see Note 18 of Notes to Consolidated Financial Statements included elsewhere in this Annual Report).

Fiscal 2013 Compared to Fiscal 2012:     On a constant currency basis, the decrease in our acquisition related and other expenses in fiscal 2013 was primarily due to the aforementioned benefits described above.

Restructuring expenses:     Restructuring expenses result from the execution of management approved restructuring plans that were generally developed to improve our cost structure and/or operations, often in conjunction with our acquisition integration strategies. Restructuring expenses consist of employee severance costs and may also include charges for duplicate facilities and other contract termination costs to improve our cost structure prospectively. For additional information regarding our restructuring plans, see Note 9 of Notes to Consolidated Financial Statements included elsewhere in this Annual Report.

Restructuring expenses in fiscal 2014 and 2013 primarily related to our 2013 Restructuring Plan, which our management approved, committed to and initiated in order to restructure and further improve efficiencies in our operations. We amended the 2013 Restructuring Plan in the third quarter of fiscal 2013 and in the first quarter of fiscal 2014 to reflect additional actions that we expect to take to improve efficiencies in our operations. The total estimated restructuring costs associated with the 2013 Restructuring Plan are $705 million and will be recorded to the restructuring expense line item within our consolidated statements of operations as they are incurred. The total estimated remaining restructuring costs associated with the 2013 Restructuring Plan were approximately $206 million as of May 31, 2014. The majority of the remaining costs are expected to be incurred through the end of fiscal 2015. Our estimated costs may be subject to change in future periods.

Restructuring expenses in