We setup a new Exchange 2016 server recently, and the client advised me that the free/busy data was not displaying correctly for the Room Mailboxes, that were invited.
Previously, a simple Set-MailboxFolderPermission -Identity MeetingRoom:\Calendar -User Default -AccessRights Reviewer command would fix it.
The MeetingRoom calendar would remove the organisers subject, and replace it with their name. It would read like:
The following commands are now required for Exchange 2016, and have been in play with Office 365 for a while now.
Using the command above, I set -User Default -AccessRights LimitedDetails
Then ran Set-CalendarProcessing -Identity MeetingRoom -AddOrganizerToSubject $false -DeleteComments $false -DeleteSubject $false
This will only effect new meetings.