This is an old revision of the document!
https://technet.microsoft.com/sv-se/library/jj710164(v=exchg.150)
Examine the mailbox:
Get-Mailbox -Identity copier@domain.tld | fl *resource*, *recipienttypedetail*
Set the mailbox as a resource account:
Set-Mailbox -Identity copier@domain.tld -Type Equipment
Preliminary info
Enable-Mailbox -Identity copier@domain.tld -Equipment
None of this is really clear!
Set-CalendarProcessing -Identity <room_name> -AddOrganizerToSubject $true -DeleteComments $false -DeleteSubject $false