Solved! How to Import Large MBOX Files to Thunderbird?

[kimwilson]

To import large MBOX files into Thunderbird, you can utilize the ImportExportTools NG add-on. Install add-on first by going to Thunderbird's "Add-ons and Themes" section. Set up "ImportExportTools NG" by searching for it. Make a folder to hold the imported emails after restarting Thunderbird. Right-click the folder, select ImportExportTools NG > Import MBOX file, and then select the file to import the MBOX file. "Import directly one or more MBOX files" is selected. Thunderbird will analyze and display the emails. If the file is really large, ensure Windows has enough resources to avoid delays during the import process. Use the BLR MBOX Converter Tool to open MBOX files in Thunderbird with ease. This solution is accessible for users to download in any version of Windows. To discover additional features, download the tool's free trial version..

 

[Aloraeve]

If you need to import MBOX file into Thunderbird, try Advik MBOX Converter. This software can easily import multiple emails of any size from MBOX files into Thunderbird. With this utility you can transfer multiple MBOX files at once. It preserves all email attributes while importing. It’s compatible with MBOX email clients like Mozilla Thunderbird, Apple Mail, Opera Mail, Eudora, and Entourage. You can try the free demo version to test its features before purchasing.