In 2015 Microsoft Corporation reported a $5.1 billion charge for the impairment of goodwill and a $2.2 billion charge for the impairment of intangible assets in one of its reporting units (segments) in its 10-K annual report. Referring to Microsoft's 2015 financial statements and any other information from the media, address the following:

Microsoft's segments serve as its reporting units for assessing goodwill for potential impairments. Which segment suffered a 2015 impairment? Describe the revenue model for this segment