Final answer:
The recommended tool to address the migration challenge is the Microsoft Office Customization Tool, which allows businesses to customize and configure Office applications like macros and plugins.
Step-by-step explanation:
Recommended Tool: Microsoft Office Customization Tool
To address the challenge of migrating from Office 2010 to Microsoft 365 while still using legacy line-of-business applications with macros and plugins, the recommended tool is the Microsoft Office Customization Tool. This tool allows businesses to customize and configure Office applications, including macros and plugins, to match their specific needs and requirements.
With the Microsoft Office Customization Tool, the company can seamlessly migrate to Microsoft 365 while preserving the functionality of their legacy line-of-business application. The tool provides a user-friendly interface for managing and deploying customizations, making it easier for employees to continue using the application efficiently.