Delete old versions of system fonts

Hi,
I have just noticed that a bunch of system fonts appear twice in my MainType font list. It appears that there is a new version (active) and an older version (inactive and not seen in the Control Panel/Fonts folder). That’s the case of fonts such as Arial, Calibri, Cambria, etc.
My question is can I safely delete the old inactive versions of these fonts from MainType? Or will it cause problems with Windows/Microsoft Office and such?
I have 123 of these and given I am using the free version, I would not mind getting rid of them if that’s safe to do to make space for other fonts.
Thanks!

Yes, you can safely delete the old versions.

Thank you!