Unexpected NDR's from Calendar events after rebuild

Hey Guys,

O/S: SBS 2003
Hardware: HP ML350

Had a server die on us, so we recreated AD and imported mailbox's and public folders to a new server.
(a less than 10 user client)

When they create meetings in outlook when a person responds to that meeting request they recieve two NDR's.

It seems to work regardless with this intermittently tho.

I am thinking maybe there was a mailbox called info prior to the new system being put in place where there is now no maillbox called info. ( it nows goes to a another mailbox)

Is there some corruption somewhere which could be causing this?

(Domain names have been replaced with domain)
NDR 1:
Delivery has failed to these recipients or distribution lists:

info
The recipient's e-mail address is invalid. Microsoft Exchange will not try to redeliver this message for you. Please check the recipient's e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.

Diagnostic information for administrators:

Generating server: saturn.Domain.local

IMCEAEX-_O=First+20Organization_ou=first+20administrative+20group_cn=Recipients_cn=info@domain.com.au
#<domain.com.au #5.1.2> #SMTP#

Original message headers:

Content-Class: urn:content-classes:calendarmessage
Subject: New Time Proposed: test 2
MIME-Version: 1.0
Content-Type: multipart/alternative;
      boundary="----_=_NextPart_002_01C8A11A.18F52600"
Date: Fri, 18 Apr 2008 14:04:44 +0800
X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0
Message-ID: <0F5B566DACB1384F9B6696B7A9D0BB8D093516@saturn.Domain.local>
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
Thread-Topic: test 2
Thread-Index: AcihF8ahLaeW1vWGQCydkL1CPJhnRAAAFqsgAABl6PA=
From: Zong <Zong@domain.com>
To: info <info@domain.com.au>


NDR 2:
Delivery has failed to these recipients or distribution lists:

info
The recipient's e-mail address is invalid. Microsoft Exchange will not try to redeliver this message for you. Please check the recipient's e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.

Diagnostic information for administrators:

Generating server: saturn.Domain.local

IMCEAEX-_O=First+20Organization_ou=first+20administrative+20group_cn=Recipients_cn=info@domain.com.au
#<domain.com.au #5.1.2> #SMTP#

Original message headers:

Content-Class: urn:content-classes:calendarmessage
Content-Language: en-US
Return-Path: <Zong@domain.com>
X-OriginalArrivalTime: 18 Apr 2008 06:04:44.0531 (UTC) FILETIME=[19462C30:01C8A11A]
MIME-Version: 1.0
Content-Type: multipart/alternative;
      boundary="----_=_NextPart_002_01C8A11A.18F52600"
X-TM-AS-Product-Ver: SMEX-7.5.0.1243-5.0.1023-15856.005
X-TM-AS-Result: No--13.241100-5.000000-31
X-PMX-Branch: TNG-Incoming
X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0
X-PMX-Spam: 8%, HTML_70_90 0.1, HTML_NO_HTTP 0.1, BODY_SIZE_3000_3999 0, BODY_SIZE_5000_LESS 0, __CT 0, __CTYPE_HAS_BOUNDARY 0, __CTYPE_MULTIPART 0, __CTYPE_MULTIPART_ALT 0, __HAS_MSGID 0, __MIME_HTML 0, __MIME_VERSION 0, __SANE_MSGID 0, __STYLE_RATWARE_2 0, __TAG_EXISTS_HTML 0
X-PMX-Virus: 5.3.3.310218, Antispam-Engine: 2.6.0.325393, Antispam-Data: 2008.4.17.225139 - CLEAN
X-TM-AS-User-Approved-Sender: No
X-TM-AS-User-Blocked-Sender: No
Accept-Language: en-US, en-AU
acceptlanguage: en-US, en-AU
Subject: New Time Proposed: test 2
Date: Fri, 18 Apr 2008 14:04:44 +0800
Message-ID: <0F5B566DACB1384F9B6696B7A9D0BB8D093517@saturn.Domain.local>
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
Thread-Topic: test 2
Thread-Index: AcihF8ahLaeW1vWGQCydkL1CPJhnRAAAFqsgAABl6PA=
From: Zong <Zong@domain.com>
To: info <info@domain.com.au>