Rainlendar is a customizable calendar that resides on your desktop and shows the days of the current month. It's possible to add events and tasks to the calendar and the appearance can be customized with different skins. Rainlendar can also show the events and tasks from Microsoft Outlook and Mozilla Sunbird. The events can be synchronized with a server, which will allow you to use it e.g. at home and at work. There are plenty of other features too.

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Source - http://www.msfn.org/comments.php?shownews=18621