MC1288236 Plan for changeFeature updateAdmin impact

Microsoft Security Exposure Management Secure Now

Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.

Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".

Schedule dates changed in the text

Date phrases in schedule sentences differ between the versions this installation saw

Seen 29 Apr 2026 ~~late April 2026~~ → April 22, 2026

Read from date phrases in Microsoft's text, not from notice metadata. A changed phrase can be a moved rollout, a new milestone or just rewording; "What changed" below shows which.

What the notice says

Microsoft’s text, with source markup removed

Introduction Microsoft is taking steps to help keep customers safe as AI models become more advanced including plans to incorporate advanced AI models directly into our Security Development Lifecycle (SDL) to identify vulnerabilities and develop mitigations and updates. We are also sharing guidance through Microsoft Security Exposure Management on how customers can reduce their exposure as well as capabilities they can use to take action. You can learn more in our blog here: AI-powered defense for an AI-accelerated threat landscape When this will happen: General Availability (Worldwide): available as of April 22, 2026 How this will affect your organization: Customers should review the guidance captured in https://security.microsoft.com/securenow and take action to reduce their exposure in areas where autonomous AI‑driven attacks gain disproportionate advantage - patching, open-source software, customer source code, internet-facing assets, and baseline security hygiene. What you need to do to prepare: Customers can review the guidance in Microsoft Security Exposure Management at https://security.microsoft.com/securenow and use the capabilities provided to take action.

What changed

Between archive captures, newest first

29 Apr 2026
… for an AI-accelerated threat landscape When this will happen: General Availability (Worldwide): ~~We will begin rolling out on late April~~ available as of April 22, 2026 ~~and expect to complete by late April 2026.~~ How this will affect your organization: Customers should review the guidance captured …
24 Apr 2026
… use to take action. You can learn more in our blog here: ~~https://aka.ms/prioritizingdefense~~AI-powered defense for an AI-accelerated threat landscape When this will happen: General Availability (Worldwide): We will begin rolling out … 2026. How this will affect your organization: Customers should review the guidance captured in https://security.microsoft.com/securenow and take action to reduce their exposure ~~to the five dimensions~~ in areas where autonomous AI‑driven attacks gain disproportionate advantage - patching, open-source software, customer source code, internet-facing assets, and baseline security hygiene. What you need to do to prepare: Customers can review the guidance …
24 Apr 2026 · first version seen

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