AWS m2 documentation change

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

File: m2/latest/userguide/ba-breaking-changes.md

Summary

Updated service availability information with closure timeline and ongoing security maintenance plans

Security assessment

Change only communicates service lifecycle updates. The security improvements mention lacks specific details about vulnerabilities or new security features, indicating routine maintenance.

Diff

diff --git a/m2/latest/userguide/ba-breaking-changes.md b/m2/latest/userguide/ba-breaking-changes.md
index bd03fde06..b1fba67e9 100644
--- a//m2/latest/userguide/ba-breaking-changes.md
+++ b//m2/latest/userguide/ba-breaking-changes.md
@@ -9 +9,3 @@ Release 5.125.0 - Breaking changes from 5.75.0
-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).