.NNT File Extension
Eudora Address Book File
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What is an NNT file?
Address book created and used by Eudora, an email client; stores contacts, such as names, nicknames, and email addresses.
NNT files, along with .TOC files, are located in the "EUDORA" directory.
NOTE: Eudora is no longer actively developed.
Common NNT Filenames
nndbase.nnt - Default name of the address book given by Eudora.