Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More
Denne tråden ble lukket og arkivert. Still et nytt spørsmål dersom du trenger hjelp.
Locked Arkivert

Importing a file of contacts

SuMo Bot

I am trying to import a CSV file of email addresses. I have three columns: First Name, Last Name and Email address. In total I have 361 rows of which Row 1 is the headers just mentioned. When I import the file, it only imports a random selection. I cannot work out why it imports some of the data and not the rest of it. Is there a limit to the amount of data that can be imported into an address book at one go?

I am trying to import a CSV file of email addresses. I have three columns: First Name, Last Name and Email address. In total I have 361 rows of which Row 1 is the headers just mentioned. When I import the file, it only imports a random selection. I cannot work out why it imports some of the data and not the rest of it. Is there a limit to the amount of data that can be imported into an address book at one go?

All Replies (1)

Try to export your existing address book in .csv format. That will reveal the structure required for a .csv file to be successfully imported into the Thunderbird Address Book. If that structure doesn't match with your .csv you'll need to adjust it accordingly.

This question has been locked because the original author has deleted their account. While you can no longer post new replies, the existing content remains available for reference.