Outlook handles user data in a secure manner. It encrypts emails, contacts, and calendar items, and stores them in a secure data center. It also uses two-factor authentication to protect user accounts. To further protect user data, Outlook has built-in anti-spam and malware protection, as well as data loss prevention features that help to identify and prevent the unauthorized sharing of sensitive information. Additionally, Outlook has a feature called Information Rights Management (IRM) that allows users to control who can access and edit their emails, documents, and other files.