Converting Thunderbird data mail to PST format manually involves exporting emails from Thunderbird in EML format and then importing them into Outlook. To do this, you first need to add-on in Thunderbird, select the emails you want to export, and save them as EML files. Next, open Outlook, create a new folder, and drag and drop the EML files into this folder. However, this manual method is time-consuming, risks data loss, and struggles with maintaining folder hierarchy and metadata. Additionally, it becomes impractical when dealing with large volumes of emails. 

To simplify the process, using a professional tool like the MCD Thunderbird Backup Tool is highly recommended. This tool allows you to directly convert Thunderbird data to PST format without the need for complex steps or risking data integrity. It supports batch conversion, preserves email properties, attachments, and folder structure, and ensures a smooth migration process. Whether you are a home user or managing a corporate migration, the MCD Thunderbird Backup Tool provides an efficient, accurate, and user-friendly solution to convert Thunderbird mail to PST effortlessly.