Converting Thunderbird emails to Outlook PST format for free is possible, but it requires a few manual steps since there is no direct export option available.
The free method involves using Mozilla Thunderbird along with Microsoft Outlook. First, make sure your Thunderbird emails are properly set up and accessible. Then, configure the same email account in Microsoft Outlook using IMAP. Once both applications are connected to the same account, your Thunderbird emails will sync to the mail server. After synchronization, open Outlook and go to
File > Open & Export > Import/Export > Export to a file > Outlook Data File (.pst) to save the emails in PST format.
While this method is free, it can be time-consuming and may not be suitable for large mailboxes. There is also a risk of incomplete syncing or missing data if the process is interrupted.
For a quicker and more reliable solution, using a professional
MBOX Converter is recommended. A trusted tool like
BLR Tools can directly convert Thunderbird (MBOX) files into PST format while preserving emails, attachments, and metadata. This makes the process simple, accurate, and hassle-free, especially for bulk data conversion.