we use non-GAAP measures of cash flows on a trailing 4-quarter basis to analyze cash flow generated from operations. We believe free cash flow is also useful as one of the bases for comparing our performance with our competitors. The presentation of non-GAAP free cash flow is not meant to be considered in isolation or as an alternative to net income as an indicator of our performance, or as an alternative to cash flows from operating activities as a measure of liquidity. We calculate free cash flows as follows:

 

 

Long-Term Customer Financing

 

We offer our customers the option to acquire our software and services through separate long-term payment contracts. We generally sell such contracts on a non-recourse basis to financial institutions. We record the transfers of amounts due from customers to financial institutions as sales of financial assets because we are considered to have surrendered control of these financial assets. In fiscal 2006, 2005 and 2004, $618 million, $456 million and $357 million or approximately 13%, 11% and 10%, respectively, of our new software license revenues were financed through our financing division.

 

Contractual Obligations

 

The contractual obligations presented in the table below represent our estimates of future payments under fixed contractual obligations and commitments. Changes in our business needs, cancellation provisions, changing interest rates and other factors may result in actual payments differing from these estimates. We cannot provide certainty regarding the timing and amounts of payments. We have presented below a summary of the most significant assumptions used in our information within the context of our consolidated financial position, results of operations and cash flows. The following is a summary of our contractual obligations as of May 31, 2006:



We acquired two companies in June 2006 and completed our acquisition of Portal Software, Inc. on July 3, 2006 for approximately $340 million in cash and approximately 2.5 million options assumed. The purchase price allocations for these acquisitions have not yet been completed.

 

Off-Balance Sheet Arrangements

 

We do not have any off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that is material to investors.

 

Recent Financing Activities

 

In January 2006, we issued $1.5 billion of floating rate senior notes due 2009, $2.25 billion of 5.00% senior notes due 2011 and $2.0 billion of 5.25% senior notes due 2016 (collectively, original senior notes) to finance the Siebel acquisition and for general corporate purposes. On June 16, 2006, we completed a registered exchange offer for the original senior notes to permit holders to freely transfer their senior notes, which have substantially identical terms to the original senior notes.

 

The 2009 notes bear interest at a floating rate equal to three-month LIBOR plus 0.23% per year, the 2011 notes bear interest at the rate of 5.00% per year, and the 2016 notes bear interest