I noticed this appeared recently in our Exchange 2010 upgrade: in certain appointments, the organizer's name will appear with the subject in the appointment. In this case, there is only one person in the appointment (the organizer) and no resources have been allocated. Can the organizer's name be removed from the calendar view?
It sounds like the user's calendar AutomateProcessing flag is set to AutoAccept, which then checks the AddOrganizerToSubject setting and, if set to true, adds the organizer to the subject as you are experiencing.
The default setting for AutomateProcessing on a user mailbox is AutoUpdate. To check what this setting currently is for the user, run this command in the Exchange Management Shell:
To set the mailbox back to AutoUpdate for the AutomateProcessing setting, run this command:
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Set-CalendarProcessing mailbox -AddOrganizerToSubject $false -deletesubject $false
That will stop Exchange from adding the organizer to the subject, and also stop it from deleting the original subject.