Thanks alot!, indeed this seems to be some Problem with UTF-8.
I have german "Umlaute" like ü,ö,ä and also ß, è, è ô etc. in my Calendar.
Removing those characters manually would be just too much Work for Weekly Updates. Even if Outport is Open-Source, I am afraid that there is nobody working on it anymore (last update was from Dec. 2003).
http://outport.sourceforge.net/
But perhaps some parts of it are going to be useful for a future true Outlook Calendar importer?
After long testing and desperate tries to do it with some Macro (with Notepad++ etc.), I found a rather easy solution that worked:
Produce the ics file with Outport (Evolution Calendar Format), open it with OpenOffice (2.0.2 here) and save it as Text (coded) and select UTF-8 in the Filtersettings. After that eventually rename it as .ics and finally you can import it in Lightning.

-ü, ö, ä etc. are now even shown correctly
Then watch the very old Bug that 10.000 Reminders pop up (all Birthdays etc.). At least it does not hang up your Computer anymore as it used to be, so it's just a lot of training for the thumb on the mouse...
But there is one real Problem that prohibits my intended use with ~weekly manual Updates per Import:
Once you have imported the data, you dont get rid of it anymore, you can delete the newly added Calendar, but as soon as you create a new one, the old Data is back (Name of new Calendar doesn't even bother). So apparently it is impossible to weekly import the Calendar from Outlook because it ends up beeing shown multiple times. Only thing you can do is delete storage.sdb, but then also external Calendars are gone...
So while I got nearer, I'm still not "there". But maybe those Results are going to help some others, perhaps it would be best to write them in some FAQ? -That would have helped me...
P.S. And thanks for the tip with the Javascript Console, sometimes it's just too simple
