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Option A - Microsoft Windows 2000³ or later

Option B - Microsoft Windows 2000³, XP, Vista or 7; 32-bit Microsoft Excel 2000⁴, 2002, 2003, 2007 or 2010 (To determine whether you have the 32 or 64-bit version of Excel, see this article.)

Option C - Microsoft Windows 2000³ or later (as of version 6.1 Option C has been replaced by Option A)

Option D - Microsoft Excel 97, 2000, 2002, 2003, 2007 or 2010

Option O - “Excel-compatible” spreadsheet program, such as Apple’s Numbers or OpenOffice.org’s Calc