Exchange folders not showing in module Messages

Hi,
I've installed VTE 4.5 free edition and I have a problem setting an imap account linked to my exchange server.
I've configured it both in Mail Server setting and in the Messages module.
The connection is ok but when I go to Settings/Folders nothing shows up.
Using a different account (i.e. gmail) everything works fine.
The Exchange server is on my LAN and other clients like thunderbird can connect and retrieve emails and folders without any problem.

Any idea?

Thanks in advance

Hi Matteo,
actually the problem was about retrieving the folder's list in the configuration step.
I've solved it by changing the login parameters:
at the beginning I used the domain.local/username format (and I got no login error) then I changed it to This email address is being protected from spambots. You need JavaScript enabled to view it. and now it's ok.

Thank you for your help
:-)