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Le 2021-01-26 à 15 h 26, Italo Vignoli a écrit :
Unfortunately LibreOffice is unable to open them without breaking their
layout (yes, I have all the Microsoft® fonts installed and configured
through fontconfig).
You cannot legally use C-Fonts (Calibri, Cambria, Candara, Consolas,
Constantia and Corbel). They are Microsoft proprietary, and their EULA
does not allow to decouple them from Windows and Office. You should
use Croscore fonts, and other fonts which emulate Microsoft fonts

You can find some suggestions here:
3. I think we should handle font substitution better. For example, when
we open a file and fonts are missing, LO should display a window with a
list of missing fonts in the first column, the font that have been used
as a substitute in the second column, and whether the font used as
substitute is metric-compatible with the missing fonts (otherwise the
layout will break, see here
<>) in the
third column. Moreover, LO should have a dataset of free
metric-compatible fonts (like Carlito to substitute for Calibri).
LibreOffice has a font replacement table, which can be configured by
the user, and ships with several fonts which are designed to be
metrically compatible with Office fonts (for instance, the Liberation

Other metrically compatible fonts can be installed by the user
(shipping all these fonts would dramatically increase the size of the

Anyway, let's discuss your ideas after FOSDEM. Interoperability is a
topic where we should definitely invest more time and efforts, and
your ideas are worth a further investigation. I can give you some
insights into the project, and we can start from there. 

Why not take a page out of the Linux distributions where there could be
a function in the "Options -> Fonts" menu, where a user could download a
set of LibreOffice approved substitutions fonts. The function could then
offer to download from a TDF/LibreOffice repository and then add them to
the user's instance of LibreOffice, and adding them as substitutions in
the "Options ->Fonts" section.

This would virtually not add any size to the installer, the user would
have an easy way of installing MSFont substitutions, and, LibreOffice
and its dev/QA/User teams would be able to vet appropriate opensource
substitution fonts for the repository. This would solve both the
concerns of the download size, and, would also solve the issue with
interoperability of fonts for MS docs (well, as best as it could be
done) ... that is, until the ODF becomes more of an accepted default.



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