Background-images aren't loaded in Office365 in Litmus and in my office365 as well. They only show when you click on “To always show content from this sender, click here”.

Because outlook.com using the same rendering engine I imagine that this could be the case for outlook.com as well, but I wasn't able to reproduce the same situation in outlook.com. Does anyone know how to change the preferences for downloading images in outlook.com/office365?

I tried background attribute, shorthand and longhand(?) css and it seems that these all get stripped.