[Discuss] Calendar application advice

[Murray Strome]

I would like some suggestions for a calendar application that I could access from all of our computers and mobile devices, make modifications from any of them, and can be viewed and modified when there is no internet connection. 
We have LINUX, MS Windows, Android (tablet & phone), Mac OS (iMac and iPad mini). 
I think that what I want is something which would use a common file which could be in something like Dropbox so it would be available when not connected, but then automatically synchronized with all the devices whenever they were connected. 
I think that Dropbox is the best place to store the file (perhaps an iCal file would be a good candidate for the format), but what application could make use of it from all the devices/operating systems? 
Any suggestions? 
Thanks. 
Murray 
PS I have looked at Google Calendar and Yahoo! Calendar. They are OK as web based applications but as far as I can tell, they don't keep copies locally. Also, they require login, and it gets complicated when you want a single calendar for multiple users with different passwords. I cannot remember if the LINUX jPilot uses exactly the same format for its storage as the Palm Desktop on Windows and MacOS, of if there is a version for Android tablets/phones and Mac products. That would be a possible candidate but the files structure is pretty complicated and tends to be quite bloated. 
>From the presentation at the last BB&C General Meeting, it would appear that Outlook might be a candidate, except that I have not figured out how to make it work in LINUX. Furthermore, I would much prefer an Open Source application. 



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