Exchange 2010 - OWA - The email address that you entered couldn't be found

Getting the message below when trying to send (via OWA 2010) to a user that was deleted and then recreated. If the user is chosen from the Address Book it works OK, but it is like there is an incorrect cached copy of the address in OWA that is failing.
Can I clear, rebuild\fix OWA and\or exchange 2010 somehow? I have rebuilt the OAB.
Thanks

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The email address that you entered couldn't be found. Check the address and try resending the message. If the problem continues, please contact your helpdesk.





Diagnostic information for administrators:
Generating server: EX1.SLS.LOCAL
IMCEAEX-_O=ST+20LAURENCE_OU=First+20Administrative+20Group_cn=Recipients_cn=08DAVHANH@domain.local
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
Original message headers:
Received: from EX1.SLS.LOCAL ([::1]) by EX1.SLS.LOCAL ([::1]) with mapi id
 14.02.0347.000; Thu, 26 Sep 2013 12:16:16 +0100
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Theodore SPENCE <thespe@domain.local>
To: Hannah Davenport
      <IMCEAEX-_O=ST+20LAURENCE_OU=First+20Administrative+20Group_cn=Recipients_cn=DAVHANH@domain.local>
Subject: Test 2
Thread-Topic: Test 2
Thread-Index: Ac66qdCcotiTSVlJTMKdQu2fqaqWxQ==
Date: Thu, 26 Sep 2013 12:16:15 +0100
Message-ID: <44AE1D8F1F8B1C4586778C759FD9776729C05C01@EX1.SLS.LOCAL>
Accept-Language: en-GB, en-US
Content-Language: en-GB
X-MS-Has-Attach:
X-MS-TNEF-Correlator: <44AE1D8F1F8B1C4586778C759FD9776729C05C01@EX1.SLS.LOCAL>
MIME-Version: 1.0
X-Originating-IP: [10.53.0.51]
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PeteAsked:
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Nick RhodeIT DirectorCommented:
This is because its is in your autocomplete.  In OWA when you start to type out the users name an autocomplete box will pop up, highlighti t and press the delete key or the little X in the box to remove it.  Even though it is the same address it still references the old mailbox even when it has been recreated.  Removing that autocomplete address will fix the issue.  For outlook 2010 it is the suggested contact also that needs to get removed etc.
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Mark GalvinManaging Director / Principal ConsultantCommented:
We have that too. Its the Outlook Address Cache (also known as 'Auto Complete') and its a pain in the ***.

You can use the method above to delete single addresses. This is what we have to do.

Thanks
Mark
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PeteAuthor Commented:
can you clear outlook address cache's remotely? or by account? we have a single mail server with 1500 users.

thanks, it does work though!
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Mark GalvinManaging Director / Principal ConsultantCommented:
Per user as it is stored in the users outlook! like I said pain!!
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Nick RhodeIT DirectorCommented:
I had the same issue with a user with a corrupt mailbox last year.  I had to put out the fire as it came in and did not find a way to do it.  I have read about ways to flush their autocomplete in general (that means all addresses and if I did that I would have alot more trouble because the users would blow up) but did not come across an actuall how-to.
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