To migrate from Thunderbird to Outlook, you can follow these steps:

• In Thunderbird, go to the File menu and select “Export.”
• Select “Address Books” and then click “Next.”
• Choose the address book you want to export and click “Next.”
• Select a location to save the exported address book and click “Save.”
• In Outlook, go to the File menu and select “Open & Export.”
• Select “Import/Export” and then click “Next.”
• Choose “Import from another program or file” and then click “Next.”
• Select “Comma Separated Values” and then click “Next.”
• Select the exported address book file and then click “Next.”
• Choose the destination folder for the imported address book and then click “Next.”
• Click “Finish” to complete the import process.

Alternatively, you can also use a third-party tool to migrate your email, contacts, and other data from Thunderbird to Outlook. I recommend you try the most trusted and reliable Cigati Thunderbird Backup Tool to migrate thunderbird emails to Outlook and many other email clients in no time.