Outlook IMAP Issue

hi to everybody

i've got a problem with Outlook 2003. I'm trying to use my email (of an italian provider: Libero) with the IMAP protocol.. everything seems to work, but the email I send are being saved in Personal Folder/Sent Items, instead of IMAP Folder/Sent Items..

The email, in other words are saved locally and not online..

I've been searching around and there's some people which say that i must set the IMAP Root Folder Path with something like "INBOX." .. but it doesnt seem to work.

What can i do ?

Thank you for your help :)