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Read more:- Import PST Files Into Thunderbird Without Outlook
Step 1: Make Outlook your default program for sending/receiving emails. Go to the Start button and click Default Programs >> Set your default programs.
Step 2: Select Outlook from the Programs tab and click Set this program as default. Then click OK to save the changes.
Step 3: Now, launch Thunderbird and click on the Display the Thunderbird Menu option.
Step 4: Go to Tools >> Import.
Step 5: Select Mail, or you can select the Import Everything option and click Next.
Step 6: Select Outlook as the file type and click Next.
Step 7: In the last window, click on the Finish button to complete the import process.
Regards,
Peter