A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
This is a bad workaround. The Logitech software is essentially mapping the horizontal scroll clicks to actions that Office 2013 does support. You don't need the Logitech software, or software for any other mouse brand. If it works in most application, that means the horizontal scroll function is essentially working. It's up to an application whether or not to respond to the events triggered by horizontal scrolling.
Microsoft, could you just admit that this is a bug in Office 2013 please?
We all know that's the case, so you might as well admit it. You don't need to keep up your image of producing perfect software. Everyone makes mistakes. No biggie. As long as you admit it and fix it, no harm is done.