Hi Jelmer, headervalue property is "hidden" property used internally by our company, but the meaning is not secret ... it is the similar thing as (from config,js): // - hrefLabel // This option sets the server name in the resource header (useful if // you want to see custom resource header above the collections). // You can use the following variables in the value: // %H = full hostname (including the port number) // %h = full hostname (without the port number) // %D = full domain name // %d = only the first and second level domain // %P = principal name // %p = principal name without the @domain.com part (if present) // %U = logged user name // %u = logged user name without the @domain.com part (if present) // If undefined, empty or or null then '%d/%p [%u]' is used. // Examples: // hrefLabel: '%d/%p [%u]' // hrefLabel: '%D/%u' // This property is supported in: // globalAccountSettings // globalNetworkCheckSettings // globalNetworkAccountSettings (available in auth module only) We use this property do group collections (each person has one calendar) into "Support", "Sales", "Service", etc. There is also a special "trick" with this hidden property - the value can be a simple text or something like "001#Support", "002#Sales", "003#Service" thus you can sort the groups (the "001#", "002#" is not shown in the interface, but it is used for sorting) - the result in the interface will be something like: [Support] Person 1 calendar (headervalue: "001#Support") Person 2 calendar (headervalue: "001#Support") ... [Sales] Person 3 calendar (headervalue: "002#Sales") Person 4 calendar (headervalue: "002#Sales") ... [Service] ... it contains the JSON representation of current settings such as: loaded calendars (e.g. loaded delegated calendars), enabled calendars (checkbox in the interface) and much more ... so next time you login you will see the same calendars you loaded/enabled during the previous "session" ... these settings can be "reset/ignored" if you press the shift button when clicking to the login (arrow) icon the calendar-color is a property used by Apple (it is the color of calendar you see in the interface - hex notation such as: #ff00c5), the "addressbook-color" is our property, because we have colorful interface also for addressbooks (hex notation) ... you can set the hex color also in the interface - hold the shift button and click to the collection color (it will show not only the color picker but also the hex value) yes Cheers, JM