NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed Microsoft Corp.'s (Microsoft) ratings, including the Long-term Issuer Default Rating (IDR) at 'AA+'. The Rating Outlook is Stable. Fitch's actions affect approximately $23.7 billion of total debt. A full list of ratings follows at the end of this release. KEY RATING DRIVERS --Fitch's expectations that Microsoft Windows will remain the primary operating system (OS) for servers and PCs, despite lackluster adoption of Windows 8 and 8.1 for PCs,


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