Sharing Exchange 2010 calendars for room mailboxes

I have a few room mailboxes in Exchange 2010 and I want a couple of people (office admins) to be able to add the room calendars in their Outlook (by clicking on the "open shared calendar" link). Is there a way to configure sharing/permissions for these room mailboxes on the server (via EMC or Powershell)? I have used the Add-MailboxFolderPermission cmdlet to give "Owner" rights but when I try to add the Calendar I get "The Calendar Folder could not be found". Thanks.
criskritAsked:
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Simon Butler (Sembee)ConsultantCommented:
The command you have used is correct.
If you open the mailbox in Outlook (using an account with Full Mailbox Access) does the permission show?

If you use get-mailboxfolderpermission does it show the permission correctly?
https://technet.microsoft.com/en-us/library/dd335061(v=exchg.141).aspx

Simon.
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pcmghouseCommented:
if the permissions are ok, mostly the issue can be that the room name is not typed in correctly.
Click on Open Calendar/From Address Book/Find the name in the global address book.

Also note that when you want users to delete items from the calendar you should give permissions to the deleted items folder of the shared mailbox also.
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criskritAuthor Commented:
Hello, thanks for the replies.

The calendar is added through browsing the GAL so there is no typo in the name. Also the permissions are there, I assigned owner rights to the whole mailbox (not just the calendar)
RunspaceId   : 5c0f5731-bcc4-4922-af27-270a23e95ccc
FolderName   : Top of Information Store
User         : Ex2010user1
AccessRights : {Owner}
Identity     : Ex2010user1
IsValid      : True

This is what I discovered: If I login to the room mbox (via OWA), go to "Share Calendar" and add my user as "Reviewer" then I can see the calendar in my Outlook. So the mailbox (owner) permissions seem unrelated and what does the trick is to "share the calendar".

So the question is: Is there a way to Share the calendar via EMC or Powershell? We have 20 room mailboxes and a handful of users that need to see the calendars, that's a lot of manual labor to do via Outlook/OWA.

Thanks
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pcmghouseCommented:
dear cris,
if you assign permissions on the top folder, the permissions do not flow to the other folders like calendar or sent items. you have to repeat the same procedure of assigning permissions for other folders.
If you need to give permissions on all the mailbox, I suggest a better way. Run this powershell on the server.
add-mailboxfolderpermission mailboxid -user username -accessrights fullaccess.
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pcmghouseCommented:
or if you just need to give permissions on the calendar:
you can run the following commands:
add-mailboxfolderpermission mailboxid:\calendar -user username -accessrights editor
add-mailboxfolderpermission "mailboxid:\sent items" -user username -accessrights author
add-mailboxfolderpermission "mailboxid:\deleted items" -user username -accessrights author

to loop thru: you need to create a script. I can give more info if you are comfortable with scripts.
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criskritAuthor Commented:
"permissions do not flow to the other folders" --> This was it. I assigned permissions explicitly to the calendar folder and it worked like a charm. Thanks! :-)
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