Because of the lack of freeware programms i decided to make a notes -> outlook converter by myself. You can try the "pre-alpha" version [here]. Just unzip it and start it with NotesCalCon.jar xxxxx.txt (before you try it you have to export your notes calendar to a structured text file --> xxxxx.txt).
you will then get a file called foo.out which you can easily import in outlook (tab separated values)
i will put the source online soon