I have happily used Windows Live Mail since Windows 7.

I have a custom font, Diavlo, that I have enabled through Font Explorer X Pro.

I created a signature with this custom font, my name, my business name and my email contact.

Since upgrading to Windows 10, none of my Font Explorer X Pro managed fonts show up in the font choice menu of Windows Live Mail. This means that my previous signature no longer works with Windows Live Mail in Windows 10.

Interestingly, I can copy a similar signature that I created in Word 2010 and paste that into a new email in Windows Live Mail and the text show up as expected with the font in question. When I select that text, the Windows Live Mail font menu is blank.

My Font Explorer X Pro managed fonts are visible in all my Office 2010 applications.