Microsoft Safe Links is a feature of Microsoft’s Defender for Office 365 which is designed to protect students, faculty, and staff from phishing attempts and other malicious activity. Safe Links works by analyzing any links for known malicious sites identified either by Microsoft or by the UM IT Information Security Office. If a site is identified as suspicious or malicious, you might be blocked from opening the site when you click it.
For more information, please see the following Knowledge Base article.