Off Topic: Sunbird calendar server?

[Jack Barnett]

This is a bit off topic, but does anyone know of a "Calendar Server" 
that is compatible with Sunbird?

Basically, I have a personal calender, then we have a "Holidays" 
calendar and my girlfriend has her own calendar.
We want to be able to share the Holidays calendar and also share 
out/view each others.

She is a fan of Google Calendars (which I admit works well), but I'm a 
fan of Sunbird (since it's local and don't need internets for it to work).
I could probably "convert" her to Sunbird if I found a good way to share 
out our calendars.