Worked as advertised
Seemed to work fine for me. I ran the program, it sensed my various email lists inside Mac Mail, I chose the one I wanted and exported to a file. Opened it directly in Excel, ran the excel menu choice for "Data - Text to Columns" and it gave me the usual choices of helping Excel understand what the delimters were, and boom. 10 minutes later I had imported the email addresses into Mail Chimp. Couldnt be easier. Did what it said it would do, with no issues. And it was fast.
Running Mac Pro with OS X 10.8.5 and 16 GB RAM.
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AB2CSV