Export Thunderbird Address Book as CSV File
- Open Thunderbird
- Open Address Book by clicking on the "Address Book" icon in the toolbar

- In the Address Book window, click Tools --> Export...

- In the Export Address Book dialog:
- Choose a location to save your address book
- Type a file name into the "File name:" text box
- Change "Save as type" to "Comma Separated"

- Click Save
Import Comma Separated Address Book into Zimbra Contacts
- Open a web browser
- Log into Zimbra
- Click on the "Preferences" tab

- Click on the "Import/Export" tab
- Under the Import section choose:
- Type: Contacts
- Destination: [Browse...] and select Contacts
- File: [Browse...] for the CSV file created by export from Thunderbird

- Click "Import"
- A green "Import Started" pop-up will appear towards the top of the Zimbra window
- When the import completes, an Informational pop-up will appear stating "Import succeeded."
- Click OK