Easy. Numbers. It's always numbers. If I can explain how this is going to save us money or make us money, I'm golden. <--- (see what I did there?)
Just noticed that, too. Hopefully that comes back soon. It's kind of frustrating to not have that as an option, since no one I know owns a Windows phone. Hopefully they'll keep Android as an option.
You will have to copy and paste the ü character into the subject line. Like this: ü ü ü ü <-- see what I did there? I pasted those "ü"s in. Here's another example of copy/paste: Have you any idea about how to write the ü (u-umlaut) character in subject line?
(or is that what you mean you already tried?)
This is my preferred method. It seems to be the simplest and most elegant, IMO. Any VML is a no-go, as it kills link tracking in * cough * some ESPs.