A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I downloaded Microsoft Mouse and Keyboard Center and double checked that my Horizontal Scrolling was on, which it was. I then when to app-specific settings and clicked Add New, then Manually Add Program and added Microsoft Excel. Side scrolling now works for me in Excel.
Note: Microsoft Excel 2013, Microsoft Wireless Mobile Mouse 4000, Windows 10 64-bit