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).

# Create an AWS Mainframe Modernization application
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Use the AWS Mainframe Modernization console to create an AWS Mainframe Modernization application. Creating an application allows you to perform tasks with the migrated mainframe workload.

These instructions assume that you have completed the steps in [Set up for AWS Mainframe Modernization](setting-up.md).

## Create an application
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**To create an application**

1. Open the AWS Mainframe Modernization console at [https://console.aws.amazon.com/m2/](https://console.aws.amazon.com/m2/).

1. In the AWS Region selector, choose the Region where you want to create the application.

1. On the **Applications** page, choose **Create application**.

1. On the **Specify basic information** page, in the **Name and description** section, enter a name for the application.

1. (Optional) In the **Application description** field, enter a description for the application. This description can help you and other users identify the purpose of the application.

1. In the **Engine type** section, choose **AWS Transform for mainframe** for automated refactoring, or **Micro Focus (Rocket)** for replatforming.

1. In the **KMS key** section, choose **Customize encryption settings** if you want to use a customer managed AWS KMS key. For more information, see [Data encryption at rest for AWS Mainframe Modernization service](data-protection.md#encryption-rest).
**Note**  
By default, AWS Mainframe Modernization encrypts your data with a AWS KMS key that AWS Mainframe Modernization owns and manages for you. However, you can choose to use a customer managed AWS KMS key.

1. (Optional) Choose an AWS KMS key by name or Amazon Resource Name (ARN), or choose **Create an AWS KMS key** to go to the AWS KMS console and create a new AWS KMS key.

1. (Optional) In the **Tags** section, choose **Add new tag** to add one or more application tags to your application. An application tag is a custom attribute label that helps you organize and manage your AWS resources).

1. Choose **Next**.

1. In the **Resources and configurations** section, use the inline editor to enter the application definition. Alternatively, choose **Use an application definition JSON file in an Amazon S3 bucket** and provide the location of the application definition that you want to use. For more information, see [AWS Transform for mainframe application definition sample](applications-m2-definition.md#applications-m2-definition-ba) or [Rocket Software (formerly Micro Focus) application definition](applications-m2-definition.md#applications-m2-definition-mf).

1. Choose **Next**.

1. On the **Review and create** page, review the information that you entered, and then choose **Create application**.