Please try ImportExportTools (Mozilla Add-ons).

From where you would import contact? Gmail or other service? For your language ImportExport Tools

Thanks. My wife wants her messages and contacts to be imported from MS Outlook 2003 and maintained in their folders.

see here Outlook Import and Import.pst files

This support forum is currently for questions about Firefox, Firefox for Android, and Firefox OS. See Mozilla Support rules and guidelines: Posts in the Firefox support forum must be either questions about the use of Firefox or answers to those questions. Users who post about things other than Firefox support will be directed to an alternative discussion place (ex: mozillaZine) if appropriate.

Your question is about Mozilla Thunderbird for your Windows 8 notebook. If you need more help please visit the Thunderbird Help site at https://support.mozillamessaging.com (see Get community support for additional support options).

Sorry about that. Many thanks for your redirection.

No problem!

I'll close this thread.