Outlook Attachment Alarm 

Outlook Attachment Alarm add-in will remind you to insert an attachment if the body of the message implies it. The add-in is very easy to use and requires no hard tuning.
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PIMEX 

This slick organizer and PIM will keep track of your contacts, distribution lists, manage your schedule, remind about appointments and events, and keep your daily notes in order. It will also print labels, envelopes, letters, send emails and more.
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Days Away 

Days Away will periodically remind you of upcoming events by discreetly fading in to focus, pausing for you to read the events, and discreetly fading back out.
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Personal Assistant 

How to organize the day of our life? Try Personal Assistant - powerful personal information manager and day planner. This profesionally developed and well designed event planner will track your everyday tasks, save you diary, remind about holidays.
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Klick-N-View Reminders 

Klick-N-View Reminders is a simple, flexible tool you can use at home or in the office to remind yourself of reoccurring and one-time events. Additional features include a printable To Do list and desktop Sticky Notes with alarm.
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Multi Reminders 

A program to remind you of birthdays, bill payments, and appointments. Reminders can be periodic (eg, weekly, fortnightly, monthly, quarterly, yearly). And you can specify how many days notice to give you. Checks for reminders every time you startup
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