[bug-mailutils] folder browsing

[Christian Fontana]

Hello.

I'm new to mailutils library.
I'm trying to write a small program that scans my "maildir" mailbox in order 
to retrieve some statistics about mails I've received.

I successfully read the needed info from messages but I'm not able to list the 
subfolders in a folder.

When I call mu_folder_open an error message is displayed "Function not 
implemented". I looked in the code but I was not able to find this error. Is 
this due to the fact I'm trying to browse a mailbox in maildir format? In 
this case, which format support mu_folder_open and mu_folder_list functions?

Thanks in advance
Christian