Users getting delivery failed when sending to a specific user

I have a user , will call him user-a, that is not getting any meeting requests sent to him.
When other users try and send a meeting request to him they get a delivery failed report sent back.

This User-A has no proplems sending out meeting requests or sending/receiving normal email.
Only problem is that he can't get any meeting requests sent to him.

I am running a Exchange 2007 server on a 2008 server.
And my users are running XP with Outlook 2007.

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check if this is of any help
HordurSvAuthor Commented:
I went through this solution.

And I did not find anything wrong with the legacyExchangeDN attribute on the user.

can u paste the legacydn here?
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HordurSvAuthor Commented:
the legacydn looks like this.

/o=OrganizationName/ou=First Administrative Group/cn=username

not going to post the actual info for work reasons
HordurSvAuthor Commented:
Here is also the undeliverable report

Diagnostic information for administrators:

Generating server:
#550 4.4.1 STOREDRV.Deliver: connection timed out. The following information should help identify the cause: "MapiExceptionUnableToComplete:16.18969:DD1D0000, 17.27161:000000005E020000000000006D00000000000000, 255.23226:00000000, 255.27962:7A000000, 255.27962:0A000000, 255.27962:0E000000, 255.27962:0A000000, 255.27962:0C000000, 255.17082:00040480, 0.18273:2B000000, 4.21921:00040480, 255.27962:FA000000, 255.1494:0F010480, 255.1238:0F010480, 6.21970:0F01048002018A670F010480, 4.23921:EC030000, 6.21970:0F0104800300F1670F010480, 6.21970:0F010480020185670F010480, 6.21970:0F01048040008F66E7FAFFFF, 6.21970:0F01048002018667E7FAFFFF, 6.21970:0F01048040008F660F010480, 6.21970:0F010480020186670F010480, 6.21970:0F01048040008F660F010480, 6.21970:0F010480020186670F010480, 4.8916:E7FAFFFF, 4.14219:E7FAFFFF, 4.15243:E7FAFFFF, 4.12427:E7FAFFFF, 4.5312:0F010480, 6.21970:0F010480008013360F010480, 4.31473:0F010480, 6.21970:0F010480008013360F010480, 4.31473:0F010480, 4.6926:00040480, 255.1750:EF7B0000, 255.31418:9D000000, 0.21457:00000000, 4.19665:00040480". ##

Original message headers:

Received: from ([::1]) by ([::1])
 with mapi; Thu, 6 Oct 2011 11:20:12 +0000
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: =?utf-8?B?SMO2csOwdXIgU3ZlaW5zc29u?= <>
To: Username <>
Date: Thu, 6 Oct 2011 11:20:11 +0000
Subject: =?utf-8?B?ZmxlaXJpIHByw7NmdW5hciBmdW5kYXJib8Ow?=
Thread-Topic: =?utf-8?B?ZmxlaXJpIHByw7NmdW5hciBmdW5kYXJib8Ow?=
Thread-Index: AcyEGeluPwzqvrT4SkKwfeKY8ZFI0w==
Message-ID: <>
Accept-Language: en-US, is-IS
Content-Language: en-US
X-MS-TNEF-Correlator: <>
MIME-Version: 1.0
X-TM-AS-Product-Ver: SMEX-
X-TM-AS-Result: No--32.275800-0.000000-31
X-TM-AS-User-Approved-Sender: Yes
X-TM-AS-User-Blocked-Sender: No
Madan SharmaConsultantCommented:
As per bounce mail its showing timeout error. just dismount the database and remount it also try to reboot your server. please also tell us about your exchange design if it is in clustering or what. there may be some permission issue also ..
HordurSvAuthor Commented:
there is no clustering.

It is just a single Exchange 2007 server
Madan SharmaConsultantCommented:
ok then just try to mount and dismount your database once and also a reboot. Also chek if there are any logs file in event viewer

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HordurSvAuthor Commented:
I did the reboot and that had no effect.

I will try the dismount and re-mount of the database next.

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