http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/resource-mailboxes-exchange-2010-part1.html

http://technet.microsoft.com/en-us/library/bb124952%28v=exchg.141%29.aspx

http://technet.microsoft.com/en-us/library/bb124374%28v=exchg.141%29.aspx

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

https://docs.microsoft.com/en-us/powershell/module/exchange/mailboxes/enable-mailbox?view=exchange-ps

https://docs.microsoft.com/en-us/powershell/module/exchange/users-and-groups/enable-mailuser?view=exchange-ps

Enable-Mailbox -Identity copier@domain.tld -Equipment

https://practical365.com/exchange-server/show-full-freebusy-exchange-2010-room-resource-mailboxes/

https://blog.ctglobalservices.com/office-365/bfa/enable-users-to-show-calendar-information-of-room-mailboxes/

In Exchange Management Shell:

Show calendar details:

Get-CalendarProcessing -Identity RoomName | fl

Show current access rights:

Get-MailboxFolderPermission RoomName:\Calendar

The default is {AvailabilityOnly}.

Set the default access rights to {Reviewer}:

Set-MailboxFolderPermission RoomName:\Calendar -User Default -AccessRights Reviewer

Once permissions are given, you may also need something like:

Set-CalendarProcessing -Identity <room_name> -AddOrganizerToSubject $true -DeleteComments $false -DeleteSubject $false