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). 

# Configure the AWS Transform for mainframe managed application
<a name="ba-app-config"></a>

You can configure your application to include access to legacy utilities. You can customize additional properties as well. In order to understand what you can configure and where, refer the [Structure of AWS Transform for mainframe managed applications](applications-m2-other-resources-structure.md) section to understand the overall structure of an AWS Transform for mainframe modernized application.

**Topics**
+ [Structure of AWS Transform for mainframe managed applications](applications-m2-other-resources-structure.md)
+ [Configure access to utilities for managed applications](applications-m2-ba-utilities.md)
+ [Add configuration properties for the managed application with AWS Transform for mainframe engine](applications-m2-ba-config-props.md)