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BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Sabre//Sabre VObject 4.5.6//EN CALSCALE:GREGORIAN METHOD:REQUEST BEGIN:VFREEBUSY DTSTART:20250116T060000Z DTEND:20250117T060000Z ORGANIZER:mailto:admin@imap.localhost ATTENDEE:mailto:admin@imap.localhost ATTENDEE:mailto:user@imap.localhost ATTENDEE:mailto:empty@imap.localhost END:VFREEBUSY END:VCALENDAR