Thanks a lot for the explanation. Yes, the problem is fixed.

I have solved the problem. Apparently, the urls needed to display the ajax interface of Zimbra are the following: /zimbra/?app=contacts; /zimbra/?app=calendar; /zimbra/?app=mail;

After searching a lot, I've found this information here: Departement Computerwetenschappen - Zimbra Calendar

I am using the following urls on a website to load the zimbra application and open the mail, contacts and calendar tabs inside: /zimbra/h/search; /zimbra/h/search?st=contact; /zimbra/h/calendar; after I pre-authenticate with an existing user account. Inside the preferences of the zimbra account, if ...