Open email composer on a separete windows will open a black page.
open email composer.

click to open on a separated window.

nativefier --help to see if an existing option could fit your needs?nativefier --version): v7.6.10node --version): v10.15.0Windows 10Might be similar to #699
Outlook 365 works on my machine now, and don't know whether it relates to "The new Outlook" feature.
nativefier \
-n "Outlook-Office365" \
--maximize \
--show-menu-bar \
--internal-urls ".*(office|office365|sharepoint|microsoft|onenote)\.(com).*" \
--tray \
--counter \
--single-instance \
'https://outlook.office.com/owa'
nativefier --version): v7.6.10node --version): v10.14.2Ubuntu 16.04
Just to add to this, I had to add microsoftonline.com to the list of internal URLs to be able to login correctly. So:
nativefier \
-n "Outlook-Office365" \
--maximize \
--show-menu-bar \
--internal-urls ".*(office|office365|sharepoint|microsoft|microsoftonline|onenote)\.(com).*" \
--tray \
--counter \
--single-instance \
'https://outlook.office.com/owa'
Most helpful comment
Outlook 365 works on my machine now, and don't know whether it relates to "The new Outlook" feature.
nativefier --version):v7.6.10node --version):v10.14.2Ubuntu 16.04