We care experiencing a huge issue with all our domains (and related customers) managed by (Plesk 10.4.4 Update #47). All the email accounts that are trying to send email using Outlook have autentication failure. The problem in only with sending email (SMTP autentication error) and only with outlook clients. Is there any Plesk Outlook incompatiblity?? This is a URGENT issue, we have all the customers quite upset.