Marti wrote:

Navigation Pane width doesn't do anything, still missing letters. I
repaired MS Office successfully, but that didn't help, either...

Two other things to try. One is to delete the file yourprofilename.xml in
the (hidden) folder
%AppData%\Microsoft\Outlook (where "yourprofilename" is the name of your
mail profile) and the other is to try running Outlook once with the
/resetfoldernames command line switch.
--
Brian Tillman