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Revenue recognition for multiple-element arrangements requires judgment to determine if multiple elements exist, whether elements can be accounted for as separate units of accounting, and if so, the fair value for each of the elements. Judgment is also required to assess whether future releases of certain software represent new products or upgrades and enhancements to existing products. Certain volume licensing arrangements include a perpetual license for current products combined with rights to receive unspecified future versions of software products and are accounted for as subscriptions, with billings recorded as unearned revenue and recognized as revenue ratably over the coverage period. Software updates are evaluated on a case-by-case basis to determine whether they meet the definition of an upgrade, which may require revenue to be deferred and recognized when the upgrade is delivered. If it is determined that implied post-contract customer support (PCS) is being provided, revenue from the arrangement is deferred and recognized over the implied PCS term. If updates are determined to not meet the definition of an upgrade, revenue is generally recognized as products are shipped or made available. Microsoft enters into arrangements that can include various combinations of software, services, and hardware. Where elements are delivered over different periods of time, and when allowed under U.S. GAAP, revenue is allocated to the respective elements based on their relative selling prices at the inception of the arrangement, and revenue is recognized as each element is delivered. We use a hierarchy to determine the fair value to be used for allocating revenue to elements: (i) vendor-specific objective evidence of fair value (VSOE), (ii) third-party evidence, and (iii) best estimate of selling price (ESP). For software elements, we follow the industry-specific software guidance which only allows for the use of VSOE in establishing fair value. Generally, VSOE is the price charged when the deliverable is sold separately or the price established by management for a product that is not yet sold if it is probable that the price will not change before introduction into the marketplace. ESPs are established as best estimates of what the selling prices would be if the deliverables were sold regularly on a stand-alone basis. Our process for determining ESPs requires judgment and considers multiple factors that may vary over time depending upon the unique facts and circumstances related to each deliverable. Customers purchasing a Windows 10 license will receive unspecified updates and upgrades over the life of their Windows 10 device at no additional cost. As these updates and upgrades will not be sold on a stand-alone basis, we are unable to establish VSOE. Accordingly, revenue from licenses of Windows 10 is recognized ratably over the estimated life of the related device, which ranges between two to four years. The new standard related to revenue recognition will have a material impact on our consolidated financial statements. See Note 1 Accounting Policies in the Notes to Financial Statements (Part II, Item 8 of this Form 10-K) for further discussion