Why is PFDAVadmin tool unable to assign Readonly permissions to everyone for a Resource mailbox exchange 2007

We have an Exchange 2007 on SBS 2008 machine. I created 3 resource mailboxes about 2 weeks ago and used PFDAVAdmin tool to assign read-only (reviewer) permissions to the in-built group "Everyone" which worked perfectly.

Now when I'm trying to Use the tool again I get the following error

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PFDAVAdmin - Folder Permissions
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Exception: The remote server returned an error: (401) Unauthorized.
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OK  
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I'm logged in as a Global Administrator.When I try to connect the tool to the exchange server it is connected correctly and displays all the mailboxes as well.

The error appears when I right click the Room mailbox which i just created and click on the first option "Folder Permissions". Please Assist.
FixKar ServicesAsked:
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FixKar ServicesAuthor Commented:
Is anyone available to help me with this issue please ?
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Adam FarageEnterprise ArchCommented:
Can you get a list of the permissions on the mailbox via Exchange Management Console?

Get-MailboxFolderPermissions | FL > C:\MailboxFolderPermissions.txt

Get-MailboxPermissions | FL > C:\MailboxPermissions.txt


Upload both of these files here. The Get-MailboxFolderPermissions *might* not work, as I think that is a Exchange 2010 / 2013 command but its a good starting point.
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