Outlook 2010, OWA & Exchange 2007 Resource booking problem


I have an issue with users booking a room that is on Exchange 2007 server.  When they try and book the resource using Outlook 2010 or OWA they get an NDR with the following error:

#Resource: Board Room (2nd Floor)
Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.


Sent by Microsoft Exchange Server 2007

Diagnostic information for administrators:

Generating server: server.domain.com

#550 5.7.1 RESOLVER.RST.NotAuthorized; not authorized ##

Original message headers:

Received: from server.domain.com ([ip address]) by
server.domain.com ([ip address]) with mapi; Wed, 20 Apr 2011
 16:03:00 +0100
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: User <user@domain.com>
Date: Wed, 20 Apr 2011 16:03:00 +0100
Subject: test
Thread-Topic: test
Thread-Index: Acv/bAoT8eJGvfrZRjmFlJLQVlcAvQ==
Message-ID: a266891f-0dec-4b8c-a262-c7cb61c6e62f
Accept-Language: en-US, en-GB
Content-Language: en-GB
X-MS-TNEF-Correlator: a266891f-0dec-4b8c-a262-c7cb61c6e62f
MIME-Version: 1.0

Now, if a user that is using Outlook 2007 tries to book the room, they are able to book the room without any issues.

All users have the same rights to book the room, whether they are Outlook 2007 or Outlook 2010 users.

Has anyone else come across this issue before?  Very baffling.


Who is Participating?
Satya PathakLead Technical ConsultantCommented:
novatekitsolutionsAuthor Commented:
I had to recreate the Resource, but still having the same issue, mainly occurring with Outlook 2010 users.
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