for some reason some of my Umlauts work, others not.
For your fun, see here:
The capital Ä turns weird, and the capital Ü does not get displayed at all. The rest looks just fine.
I am confused.
Here's my MWE:
\documentclass[11pt,a4paper]{letter} % Specify the font size (10pt, 11pt and 12pt) and paper size (letterpaper, a4paper, etc)
\usepackage[utf8]{inputenc}
\usepackage[english, german]{babel}
\usepackage{hyperref}
\usepackage{graphicx} % Required for including pictures
\usepackage{microtype} % Improves typography
\usepackage{gfsdidot} % Use the GFS Didot font:
http://www.tug.dk/FontCatalogue/gfsdidot/
\usepackage{miama}
\usepackage[T1]{fontenc} % Required for accented characters
\usepackage[official]{eurosym}
\usepackage{setspace}
\begin{document}
\begin{letter}
{Address}
\opening{
Sehr geehrte Damen und Herren,}
blah blah
a Ä ä\\
o Ö ö\\
u Ü ü\\
\closing{Mit freundlichen Grüßen \LARGE \fmmfamily }
\end{letter}
\end{document}
Maybe some of the packages collide with each other?
Thank you for any hints!



hyperrefpackage should be loaded as the last package, with very few exceptions (most notablecleveref). – Bernard Sep 14 '17 at 12:25Addressis not German ;-) It'sAdresse– Sep 14 '17 at 12:31