You could check out the following projects.  They may, or may not, meet 
all of your needs, but they should each come close in some way:
Chandler (http://www.osafoundation.org/) is still in development, but 
may be the closest to what you need, and it pretty much works for basic 
tasks now.
Mozilla Sunbird (http://www.mozilla.org/projects/calendar/) is sort of 
working, and may have much of what you're looking for.
Aethera (http://www.thekompany.com/projects/aethera/) is a 
released(1.2.0) GPL product, but it's sharing may be a bit limited 
without a Kolab server (althought there may be some WebDAV support...).
Task Coach (http://sourceforge.net/projects/taskcoach/) starts to get 
there, but it's currently missing the reminders you wanted (but combined 
with something like Sunbird, it might work well...)
KDE/Pi (http://sourceforge.net/projects/kdepimpi/) is an attempt to make 
the KDE programs available cross platform, and might provide what you need.

One last, a Java application that looks very promising:
BORG (http://borg-calendar.sourceforge.net/) may be just what you're 
asking for, try it and please let us all know if it fits.


Bryan.ONeal@asu.edu wrote:

>OK,  I am in even more desperate need of a good PIM.  I am willing to cut the
>outlook .pst import/export requirement, and for that matter I am willing to
>cut every thing except the Task list and Calendar.  But the I need a task and
>calendaring program that
>	Will synch to a central file (preferably via ssh to my server, but if
>I have to manually copy a few files up and down it is OK)
>	Can be run on windows (without admin privileges is preferable, but I
>can live without)
>	Can be run on OS X
>	Can be run on other *nix's
>	The task list needs to be tiered, such that I can put down something
>like Arrange RSS Conference and then underneath it put subtasks like, Arrange
>Location, Arrange Speakers, Arrange Venders, etc.  And under those put tasks
>like Arrange Location -> UAC Conference Room, TCC Auditorium, etc.  
>
>I have seen pluggins for outlook that do this, but I need something a bit more
>portable  Any suggestions, keeping in mind I am a poor starving college
>student?
>
>I am more then willing to dump everything I have now and start with a new
>system if it meets the requirements above.  Heck if I can get a task list that
>does reminders I can dump the calendaring requirement as well. 
>
>Any suggestions would be most appreciative
>
>(Yes, I have thought about just programming one in JAVA but I hardly have the
>time)
>
>
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