MacJournal 6 won't accept my existing serial number.
MacJournal 6 is a paid upgrade, and uses serial numbers that are specific to MacJournal 6.
MacJournal 6 serial numbers start with "MJ600-". If your serial number starts with "MJ500-," "MJ400-," or any other prefix, it is not a valid MacJournal 6 serial number.
Current owners of MacJournal 6 may be eligible for upgrade pricing.