Microsoft is busy rolling out new curvy and colorful new Office icons, and now it’s revealing a set of design concepts it experimented with before finalizing these new icons. Some of the concepts are radically different from what Microsoft is shipping, with design explorations for Word, Excel, and PowerPoint that more closely resemble the Office for Mac icons of the past.
https://www.theverge.com/news/799736/microsoft-office-icons-test-versions