When moving from Thunderbird to Outlook, the main challenge is that Thunderbird stores emails in MBOX format, while Outlook primarily works with PST files. The easiest approach is to first convert the Thunderbird MBOX files into Outlook-compatible PST format. SysInfo MBOX Converter can scan the Thunderbird MBOX files, display the email data in a preview, and convert the selected emails into PST. It also supports bulk MBOX conversion, so multiple files can be processed together. During the conversion, the folder hierarchy and email data can be preserved, making it easier to organize the emails after opening the PST file in Outlook. Users can add individual MBOX files or folders, preview the contents, select the required mailbox folders, and then choose PST as the output format. This approach avoids manually moving emails one by one and is useful when a Thunderbird mailbox contains a large amount of archived data.
Read more: https://www.sysinfotools.com/recovery/mbox-converter.php