Aid4Mail 

Migrate emails to another mail client, export them for viewing in IE, Excel, or a database, and archive them to save space or for compliance with legal requirements. Supports many mail clients and processes all messages without losing any information
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POP 'N' Check! 

POP 'N' Check resides in the system tray, checking your mail on POP3 servers on given intervals. It tells you when you've got new mail! Yay!
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