 Microsoft intended Solitaire "to soothe people intimidated by the operating system," and at a time where many users were still unfamiliar with graphical user interfaces, it proved useful in familiarizing them with the use of a mouse, such as the drag-and-drop technique required for moving cards.According to Microsoft telemetry, "Solitaire" was among the three most-used Windows programs and "FreeCell" was seventh, ahead of Word and Microsoft Excel.Lost business productivity by employees playing "Solitaire" has become a common concern since it became standard on Microsoft Windows.