Calender Sharing in Exchange 2007 using Resource Room Mailbox

We're attempting to setup a few shared calendars in our Exchange 2007 organization, and would like to not use public folders.

I understand the best way to do this and still centrally manage them, is to utilize a Resource Room mailbox and assign permissions to that.

I used the Exchange Powershell to create the Resource Room with a display name of "Workers Schedule" and set it to auto accept meeting requests. I then set 'FullAccess' permissions to the users that should be able to modify, and 'ReadPermission' to those that should only be able to view the calendar.

When I jump on Outlook 2007 with a 'ReadPermission' user, go to File -> Open -> Other Users Folder -> Select Calendar -> Select "Workers Schedule" resource room, I get a message that says I do not have access and to tick a box to send an email requesting access.

Interestingly, if I give that user 'FullAccess' and log back in with that user account, the "Workers Schedule" resource room disappears from the GAL.

Not sure why it's doing this, or what permission I may have missed?
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TercestisiConnect With a Mentor Author Commented:
The issue was that an email had to be sent to the resource mailbox before it would show up in the GAL constantly.
Insted of giving permissions thru Power Shell command, why dont you open the Outlook for the resource mailbox and set default permission to author. In this way you should be able to work with the resource.
TercestisiAuthor Commented:
Thanks for the response.

While that works to actually get access, I seem to still need to issue the FullAccess command via Powershell on the Resource Room, or users get the no permission error even if I set the default group to author/reviewer/whatever via Outlook for the Resource Room mailbox.

As a test I set a user that should only have reviewer access to FullAccess via Powershell, then to reviewer via Outlook, but the user still has FullAccess.

I sort of see what we're doing here, but I don't see anyway around the granting of FullAccess, unless I send an invite/request to each user.  That way is fine, but I'm sort of dumbfounded why I should have to do that, and not be able to do all steps right from Exchange.
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resource room disappears from the GAL.?
>> From Outlook, using the ROOM button, are we getting the resource mailboxes or not?
>> what is the response on the ONLINE mode? for GAL

Not sure..but the related link I like is:

Resource scheduling in Exchange Server 2007

C:\>Add-MailboxPermission -Identity:Resource1 -AccessRights:fullaccess -User:user1

TercestisiAuthor Commented:
Thanks for the replies.

I think our main problem now has more to do with the Resource Room disappearing from users global address list, seemingly randomly.

Any ideas on what could cause this?
Have you updated exchange 2007 with SP3?

I heard issues like user is not visible but never heard resource room is disappaering,try updating exchange SP3 & see if it resolves the issue.

Take backup of exchange while doing anything.
TercestisiAuthor Commented:
Answer in comment.
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