[imp] mailbox.php not found

[Thomas Holzmann]

Hello,

I have a problem with Horde/IMP 4.1.6: I'm accessing my mailbox with 
IMAP and the most things work fine (sending, receiving emails etc.), but 
if I want to delete messages (in inbox or sent-mail) I always get an 
error message like that:


  Not Found

The requested URL /horde/imp/mailbox.php was not found on this server.

But the URL is correct!! I also get this error at the maintenance notice 
at the beginning: If I say I want to skip maintenance I get the error, 
then I have to log in again and I get to the normal screen.

I assume I've made a very stupid mistake because I'm not very familiar 
with horde but I hope there is an easy solution for that.

Thanks in advance!

BTW: Thank you all for making such a great application!!

Regards,
Thomas