The Personal Information Manager is the ultimate boon to people doing work with their computers. Address book. Calendar. To Do List. These things are essential for really doing business with a computer. And once you go beyond doing business alone, you need to be able to share. That is harder than you'd think. Single user calendars are dime a dozen. Shared calendars.....oof.

OpenExchange. The Right Idea! Unfortunately, lack of client support means that for now, this is just a PHP groupware. http://mirror.open-xchange.org/ox/EN/community/

SchoolTool/SchoolBell has claims that it works with shared calendars and iCal, but there's no documentation and little forum usage. I'm betting it's a dead end for now. http://www.schooltool.org/schoolbell

Sure....but on Yahoo!'s servers? Nah. Plus Windows-only Sync. http://calendar.yahoo.com

A Good Tool.... http://www.phprojekt.com

Nice looking. But doesn't render right in omniweb and the server looks very intense to install. http://www.opencrx.org/index.html

I got all excited....then noticed it's been dead for two years. http://sellwincrm.sourceforge.net

'Built for the Web' http://www.ohioedge.com/factsheet.html

Windows only? http://www.saleslogix.com/home/default.php3http://ask.slashdot.org/article.pl?sid=04/11/24/1843248&tid=215&tid=185&tid=4 Daylite: Could it be 'the one'? http://www.marketcircle.com/