There is no export except that on the address book Tools menu..... so perhaps you might elucidate on what you are trying to do.

Matt said

There is no export except that on the address book Tools menu..... so perhaps you might elucidate on what you are trying to do.

I want to save my message filters and account settings.

So you want to backup.

This add-on has a backup option.

https://addons.mozilla.org/en-US/thunderbird/addon/importexporttools/

Thanks I'll have a look.

I want to save my message filters and account settings.

Backup the entire profile. There is no simple way to just backup account settings. http://kb.mozillazine.org/Thunderbird_:_FAQs_:_Backing_Up_and_Restoring

Message filters only: The file that stores your filter settings is called "msgFilterRules.dat". Each account will have its own "msgFilterRules.dat" file, stored in the "Local Directory" for the account in your profile. The Local Directory is specified at the bottom of Tools -> Account Settings -> Server Settings, right by the Browse button. The filters for Local Folders are stored in the Mail\Local Folders directory in the profile.

Backup "msgFilterRules.dat" for all accounts.