Calendar Mailboxes ("folders") can be created in your Account using the WebUser Interface or a MAPI client application (such as Microsoft Outlook). These Mailboxes appear on the Mailboxes page. Click on a Calendar-type Mailbox name to open the Calendar.
You can have several Calendar-type Mailboxes in your Account, but only one of those Mailboxes is assigned the role of the Main Calendar Mailbox. When you accept an invitation or create a new appointment or a new meeting request, the calendaring data is stored in the Main Calendar Mailbox.
When the Main Calendar Mailbox is updated, the CommuniGate Pro WebUser Interface removes the current Free/Busy information - it deletes the freebusy.vfb file in the File Storage. When someone is trying to access that file, it is rebuilt using the modified information stored in your Main Calendar Mailbox.
To create a Calendar-type Mailbox, open the Mailboxes page and select the Calendar value in the Create pop-up menu. Type the name of the Calendar Mailbox you want to create, and click the Create button: