AWS m2 documentation change

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

File: m2/latest/userguide/ba-shared-architecture.md

Summary

Added announcement about future closure of AWS Mainframe Modernization self-managed experience to new customers, with continued security investments for existing users.

Security assessment

While mentioning ongoing security improvements, this is a service availability update with no specific security vulnerability addressed or new security features documented.

Diff

diff --git a/m2/latest/userguide/ba-shared-architecture.md b/m2/latest/userguide/ba-shared-architecture.md
index 98f5fb487..3011be2f6 100644
--- a//m2/latest/userguide/ba-shared-architecture.md
+++ b//m2/latest/userguide/ba-shared-architecture.md
@@ -9 +9,3 @@ AWS Transform for mainframe runtime componentsExecution environmentsStatelessnes
-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).