With Thunderbird's Import Tool, you can import settings and data from a variety of sources including Thunderbird profiles, other applications or certain files. For example, you can use this tool to migrate accounts, messages, address books, calendars, and settings into your current Thunderbird application. The Import Tool also works hand in hand with Thunderbird's Export Tool.

How to import settings and data with the Import Tool

Here's how to get going with your import:

1. Select ≡ > Tools > Import.
2. Select an import source from the list, either one of the applications or Import from a file.
3. Click the Continue button.
4. In step 2 of the import, you will be offered more choices to specify your source. After making your choice, click the Continue button.
5. In step 3, choose what parts of the source data you want to import, then click the Continue button.
6. In the final confirmation step, you'll see a summary of your choices. Click the Start Import button to perform the import, or the < Back button to make changes.