Exchange migration mail delivery problem (2003 SBS to 2010)

I'm in the process of moving mail from an old 2003 SBS box to a new server running 2008 R2 & Exchange 2010 sp3

I was able to move a few mailboxes with the "new local move request" option in Exch2010 but a few were erroring out because the mailboxes were corrupt.

So I went to one user's PC and exported everything to a PST, I then deleted the mailbox from Exch2003, purged it and created a new mailbox on the Exch2010 server and imported the pst. All seemed to be going well I was able to email the address of the user internally (logged into my mail account through owa on the Exch2010 server), and externally.

However when other users in the office try to email this user through their outlook clients, they receive the following bounce back,

Your message did not reach some or all of the intended recipients.
      Subject:  subject
      Sent:     30/07/2014 2:37 PM
The following recipient(s) cannot be reached:
      User Name (Domain Name) on 30/07/2014 2:37 PM
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            <domainname.local #5.1.1>

I've logged onto owa on both 2003 and 2010 servers and successfully sent test internal messages from user accounts that were having issues emailing the newly moved user and these were successful. So it seems that the outlook client's are trying to send email to the old server where the mailbox no longer exists instead of sending it to the new mailbox on the new server.

Is there anyway I can force the clients to send to the new server instead of the old?
Ignimous VondlechanceAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Ignimous VondlechanceAuthor Commented:
I think I've found a fix.

Close Outlook. Go to:

C:\Users\%username%\AppData\Local\Microsoft\Outlook\

Delete the "Offline Address Books" folder.

Open outlook and sent email successfully.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows Server 2008

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.