A new publication has been created and configured to publish Calendar information, and even the option to Synchronize appointments details was selected, but published objects are not mailbox enabled and there is not calendar data.
In order for QCS to synchronize calendar information it is not enough to configure publication. After the subscriber will subscribe to a collection for calendar information synchronization, he should select the Always create mailbox check box and specify the Exchange server and mailbox store where the mailboxes will be created. This can be done by modifying the properties of a publication when using the right mouse menu and going to the Advanced tab under properties of a subscription. After this has been done mail-enabled object on the subscriber side will be created, and the Calendar information will be presented as the corresponding Free/Busy. For more information please see the User Guide and search for "Select Calendar Attributes"