By doing a quality check of my contacts, I've found that dates (birthdays and anniversaries) are again being deleted during a normal sync. Currently, the dates are deleted from my BCM Contacts and from my Calendar. And subsequently, from DJO. When I reported this problem previously, the dates would be deleted from my BCM Contacts but remain as Calendar events.

Further testing determined that when I select Reread Outlook Data, both dates (birthdays and anniversaries) remain in the Outlook Contact record, on the Outlook Calendar, and sync correctly to DJO. What I thought was a problem of the past is now a recurring problem.