MS-203 Study Guide 2026

Enabling anti-phishing policies is a critical measure to protect mail flow in Microsoft 365. These policies are designed to detect and block phishing attempts, which aim to trick users into revealing sensitive information or installing malware. By analyzing incoming emails for suspicious characteristics, anti-phishing policies help prevent malicious content from reaching user inboxes, thereby safeguarding organizational data and security.

Deleted Microsoft 365 Groups enter a soft-delete state for 30 days during which they can be fully restored with all associated resources including mailbox, SharePoint site, and Teams channel.

MFA stands for Multi-Factor Authentication, a security measure that requires users to provide two or more verification factors to gain access to an account or resource. In Microsoft 365, MFA adds an extra layer of security beyond just a password, typically requiring something the user knows (password) and something they have (phone or authenticator app), significantly reducing the risk of unauthorized access.

Set-Mailbox -Type Shared converts an existing user mailbox to a shared mailbox type.

Data Loss Prevention (DLP) policies in Microsoft 365 are designed to identify, monitor, and protect sensitive information from being accidentally or intentionally shared outside the organization. DLP can detect specific types of sensitive data (e.g., credit card numbers, social security numbers) in emails and documents, then block or warn users before the data leaves the secure environment.

Each public folder mailbox in Exchange Online has a maximum size of 50 GB.