Hi, I am trying to understand the concept of calendar sharing and I will appreciate if someone clarify this to me. 1) My main purpose is to use calendarserver as a remote calendar server that users can use remote calendar of their own via remotely. That can be done easily of course. 2) My second purpose is to create a shared calendar. For my second aim what is the best practice? I am trying to understand the calendar sharing concept. How do you do that? a)Using an account and giving out its user name and password to everybody involved? such as: <user> <uid>shared</uid> <password>shared</password> <name>shared calendar</name> </user> b) Or creating a group and adding all users to that shared group so everybody can see each others calendar that is at the same group? I have found a tutorial http://www.ronregev.com/misc/pim_server_tutorial/and actually i have applied to concept here but i can't seem to create a shared calendar especially usage of guid part as stated in that document: *If everything worked so far, then we are almost set. Almost, but not quite. The problem is that the CalDAV server identifies the calendar groups (meaning, the users) by assigning them unique, long guid values. We have to locate the newly-created guid value for our first user, and add it to the file accounts-text.xml, or the server will not know which calendar belongs to that user the next time we run it. This is why we must add one user at a time to iCal - so that we can identify the proper guid for this user.* What is the relation of uid and guid? Is it used for sharing calendar if not what is the aim of guid here? What is the aim of <user></user> and <group></group> it is just like on standart unix permissions? c) My last question is that say there is a shared calendar http://<server>/calendars/users/shared/calendar and i see that a client can make an event public or private. What is the aim of making an event public or private? It is used for calendar sharing in a grouped environment Regards.