One of the best elements of Mac OS X is the supplied iCal software, which enables you to add calendar events and 'to do' items, so you can track meetings, allocate your time and more. The Microsoft Outlook calendar is useful for the same reason.
However, there are few well-designed standalone calendars for Windows. That's about to change with the release of Mozilla Sunbird, which is shortly about to receive a 0.3 release. It's not yet up on vnunet.com for one good reason: it's only at an early 0.3 release and often in beta form. For instance, it's currently at Release Candidate 2 stage. Take a look at the project for more info.
Mozilla Lightning is the Thunderbird integrated version of the Sunbird calendar. Sun are so impressed with Lightning that they are contributing to future releases and will probably integrate within future versions of OpenOffice.
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