[Evolution] import assistant does not find mozilla mails on linux

[Denis Kuniß <kuniss grammarcraft de>]

Hi all,

im just trying to import my Mozilla mail directrory structure and all
my mails with the Evolution import assistant. But the assistant do not 
find my mails. It does not find my Mozilla mail directory automatically.
What can I do? My mail directory structure is too complex to import them
all as single mbox files.
Is there somthing to configure? Does anybody has some hints for me?

Denis