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AWS m2 documentation change

Service: m2 · 2026-07-01 · Documentation low

File: m2/latest/userguide/set-up-appstream-ba.md

Summary

Updated service availability notice with new closure date for self-managed experience and clarified Managed Runtime Environment status

Security assessment

Change relates to service availability timelines without security content. General mention of 'security improvements' lacks evidence of addressing vulnerabilities or documenting security features.

Diff

diff --git a/m2/latest/userguide/set-up-appstream-ba.md b/m2/latest/userguide/set-up-appstream-ba.md
index 36f8b5fff..d0c1bdf8e 100644
--- a//m2/latest/userguide/set-up-appstream-ba.md
+++ b//m2/latest/userguide/set-up-appstream-ba.md
@@ -9 +9,3 @@ PrerequisitesStep 1: Create an Amazon S3 bucketStep 2: Attach a policy to the S3
-AWS Mainframe Modernization Service (Managed Runtime Environment experience) is no longer open to new customers. For capabilities similar to AWS Mainframe Modernization Service (Managed Runtime Environment experience) explore AWS Mainframe Modernization Service (Self-Managed Experience). Existing customers can continue to use the service as normal. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html).
+After careful consideration, we have made the decision to close new customer access to **AWS Mainframe Modernization self-managed experience** , effective July 30, 2026. Existing customers can continue to use the service as normal. AWS continues to invest in security and availability improvements for AWS Mainframe Modernization self-managed experience, but we do not plan to introduce new features. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html). 
+
+**AWS Mainframe Modernization Service (Managed Runtime Environment experience)** is no longer open to new customers. For capabilities similar to AWS Mainframe Modernization Service (Managed Runtime Environment experience) explore AWS Mainframe Modernization Service (Self-Managed Experience). Existing customers can continue to use the service as normal. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html).