Earthlink 5.0 provides a browser-based email client with no export function. The address book is stored in ADDBOOK.DAT. I used Example 8-6 from the cookbook p.297 to dump NUL-terminated strings from the file, and chopped the stream from there to end up with a file in the form (double quote)(alias)(double quote)(space)(greater than)(smtp address)(less than)(newline) This was tested on one sample of ADDBOOK.DAT. YMMV.

C:\>perl -w strings.pl addbook.dat |
perl -p -e "s#(ELNK;plist;500)##;"
-e "s#(Eple;500 )(.+)$#\"$2\"#;"
-e "s#\"\n#\" #g;"
-e "s#[A-Za-z0-9-_@.]+$#\<$&\>#;"
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