I had a look to the API to build a web-service to Zimbra in order to display the number of unread mails and a short view of the calendars on a website by using a CMS.
The CMS know the login of the user but does not know the password.

Is there a way to do an authentication as a trusted application?
Otherwise, can we use the admin login/password to get these informations from any users?
Otherwise how to do it?