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Exchange: Calendar requests to one person bouncing

Recently, my company added a second exchange server for a separate business unit's domain. One of the users on the new server — let's call her Jane Doe — is now unable to send Outlook 2007 calendar requests to a single recipient, Bob Smith, on the old one. Plain-text and HTML emails from Jane to Bob are delivered with no problems, and Jane is able to send calendar requests to everyone else on the old Exchange.

Below are the NDR message and the diagnostic info I received, edited for privacy purposes. Anything edited is in [square brackets]. If anyone has any ideas as to what the problem might be and how to fix it, I'd greatly appreciate it.

The NDR message received:

[Bob Smith (bsmith@oldexchange.com)]
The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.

Diagnostic info:

#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
Original message headers:
Received: from VA3DIAXVS111.RED001.local ([]) by
 VA3DIAHUB008.RED001.local ([]) with mapi; Thu, 1 Apr 2010
 07:44:51 -0700
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: [Jane Doe <jdoe@newexchange.com>]
To: "[Bob Smith (bsmith@oldexchange.com)"
Date: Thu, 1 Apr 2010 07:44:48 -0700
Subject: Client process/system discussion
Thread-Topic: Client process/system discussion
Thread-Index: AcrRqeDawr0J/Fp7RPKx5LFs3Ss2VAAAAAAw
Message-ID: <7D491A9153D97B498A73F27E3738FFC9F5C3ED3F88@VA3DIAXVS111.RED001.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-TNEF-Correlator: <7D491A9153D97B498A73F27E3738FFC9F5C3ED3F88@VA3DIAXVS111.RED001.local>
MIME-Version: 1.0
1 Solution
Can she send the requests successfully using Outlook Web Access?  If so, I would say the issue is with the .OST file or with her Outlook profile.
LCMSdevAuthor Commented:
Sorry for taking so long to accept, forgot where I got this solution. Thanks for your help!

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