1PopCheck 

Retrieves emails from any standard POP3 server. Allows viewing, deleting and defining rules on emails along with many other administrative features. Emails from various accounts can be checked in a single window. Costs $9.99.
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IGetMail 

IGetMail works with your Microsoft Exchange email server to download incoming POP3 email from multiple remote servers. It supports individual and group/domain accounts. Uses dial-up networking and operates on a time/frequency schedule you define.
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iNetMail Demo 

iNetMail is a convenient web based solution for online e-mail management. It helps you check and organize any Internet mail account that uses POP3 services through your Web Browser. This is a perfect web tool for any ISP or regular internet user.
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MailGrab 

MailGrab is a command-line POP3 reader supporting binary attachments.
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Express Communicator 

Express Communicator 2.0 gives corporate message mates unparalleled speed for nonverbal communications using very little bandwidth. It provides a simple and intuitive user interface that lets you check user status quickly and send an instant message.
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Winsock Interface Library for C/C++ 

The Winsock Interface Library simplifies winsock network communications programming and provides support for the most common Internet protocols such as Finger, SMTP, POP3, FTP, NNTP, and HTTP. Includes multiple C/C++ examples.
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