Why, yes, you may use this on your non-Windows OS...


Looks like the folks at Microsoft are making subtle but interesting changes in their licensing approach for certain fonts. They seem to be moving from the generic EULA that says "While the software is running, you may use its fonts to display and print content." - IOW you can't use any of these fonts if you're not running Windows, the "software" is this context - to a EULA that says "You may install and use any number of copies of the software on your devices". IOW, please go ahead and use or test these fonts even if you happen to run something else than Windows on your devices. We don't care about exclusive rights for this any more.

The font download page for the special versions of Calibri and Sitka Small intended to help with legibility and dyslexia has:

Supported Operating System:
Linux, Mac OS X, Windows 10 , Windows 7, Windows 8, Windows 8.1

Microsoft Fluent Fonts can be installed on both 32-bit and 64-bit versions of Windows. For non-Windows platforms, there must be support for installing system-wide fonts and extracting files from a ZIP file.

Install Instructions:
For Windows platforms, select the file "Microsoft Fluent Fonts.msi" and open the file. For non-Windows platforms that support installing fonts, select the file "Microsoft Fluent Fonts for non-Windows OS.zip". Extract the files, read the file "Microsoft Fluent Fonts EULA.rtf" in a document viewer, and install the font files.

Yep, it's a post-Windows-only world after all. Who would have thought?

OK, these fonts are still freeware: unredistributable, unmodifiable and there is not reproducible buildpath, but still, interesting change of mindset...