Which tool is recommended for migrating IIS websites to Azure?

The Azure App Service Migration Assistant is the recommended tool for migrating IIS websites to Azure because it is specifically designed for this purpose. This tool helps streamline the migration process by analyzing the on-premises IIS web applications and offering insights into compatibility with Azure App Service. It provides a guided experience, effectively identifying potential issues and offering solutions or recommendations.

Using the Azure App Service Migration Assistant allows administrators to focus on essential tasks like configuration and optimization, rather than getting bogged down by the complexities of migration. Additionally, the tool facilitates moving the site's content, along with necessary configurations, making it a comprehensive solution for transitioning websites to the cloud.

While other options may assist in the process, they do not provide the same level of targeted support for migration to Azure App Services. For instance, while Web Deploy can be used for deployment tasks, it does not specifically cater to the holistic migration experience. Similarly, IIS Manager is primarily a management tool for applications on an on-premises server and lacks features tailored for cloud migrations. The PowerShell IIS Administration module offers administrative capabilities but does not simplify the migration process to Azure in the same integrative manner as the Azure App Service Migration Assistant.