Time to Upgrade: Move Your Business Central Emails to OAuth 2.0 Before March 2026
Introduction Microsoft is retiring SMTP Basic Authentication on March 1, 2026 . If your Business Central environment still uses the old username/password method for sending emails, it’s time to act. Switching to OAuth 2.0 (Modern Authentication) will keep your system secure, compliant, and ready for the future. This guide explains why this change matters and how you can make the transition smoothly. Why Switch to OAuth 2.0? Microsoft is pushing this upgrade because: Basic Auth is outdated, and risky - passwords can be hacked easily. OAuth 2.0 is more secure - uses tokens instead of passwords. Supports MFA, conditional access, and better compliance. Works perfectly with Business Central’s modern email framework. After March 1, 2026 , Basic Auth will stop working completely. How to Migrate in Simple Steps 1. Check Your Current Setup If you’re using SMTP with username/password (smtp.office365.com), you need to m...