If you are using M$ Windows and Juno 5 software, your email store and address book is stored in a folder on your local hard drive; ..\Program Files\Juno\USERxxxx. These are email: mailbox.bdb, mailbox.atr. Address Book: addrbook.nv.
If you are not, download it from Juno, install it, and the first time you access Juno via this local client, your email message store and address book will be downloaded.
Then you can use DAWN to convert the address book to whatever.
Hope this helps.