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Ultrafunk Popcorn - A freeware e-mail program, used for receiving and sending mail messages on POP3 servers, without actually downloading the e-mails to a computer. Ultrafunk Popcorn can fit on to a floppy disk due to its small file size (around 124Kb) and supports multiple user accounts. It's perfect for traveling and reading mail over slow connections. It also provides a basic level of anti-virus protection.

http://www.ultrafunk.com/products/popcorn/