Currently Being ModeratedMar 4, 2013 1:45 PM (in response to jizzlets)
Currently Being ModeratedMar 5, 2013 12:32 PM (in response to jizzlets)
Difficoult to answer.
iCloud works perfectly to sync calendars and offer this possibility to share one or more calendars.
This is not exclusive. There are other sistems which could work in a similar way but it depends on your mail system and internet provider. You have to ask him.