𝐃𝐞𝐟𝐞𝐧𝐝𝐞𝐫 𝐟𝐨𝐫 𝐎𝐟𝐟𝐢𝐜𝐞 365 𝐏𝐥𝐚𝐧 1 𝐢𝐬 𝐧𝐨𝐰 𝐛𝐞𝐢𝐧𝐠 𝐚𝐝𝐝𝐞𝐝 𝐭𝐨 𝐌𝐢𝐜𝐫𝐨𝐬𝐨𝐟𝐭 365 𝐄3 𝐚𝐧𝐝 𝐎𝐟𝐟𝐢𝐜𝐞 365 𝐄3.
This expands E3 security beyond standard spam and malware filtering with:
✔ Safe Links
✔ Safe Attachments
✔ Advanced anti-phishing
✔ Better detections and reporting
✔ Teams protection
Built-in protection will apply automatically for licensed users.
For organizations using custom mail flow, transport rules, or third-party secure email gateways, this rollout may introduce changes in filtering behavior, URL rewriting, message inspection, and policy evaluation.
Rollout timeline: Starting now, with rollout expected to complete by Fall 2026.