After mail migration - Outlook will not download emails 'item not found'

Hi Experts

I have a bit of an issue after migrating emails from an Exchange 2003 to Exchange 2007.
Extracted emails out of Exchange 2003 with Exmerge to single PSTs. (All were under the 2gb limit so no problems there).
Used the powershell to import them into Exchange 2007.
The emails went in fine, no errors reported at all.

However, here is my issue..
I login to the account with some imported mail from old server.... I open Outlook 2003 or Outlook 2007 (2 separate PCs) and I check the inbox. All appears empty. I select Send/Receive and an error appears saying 'item not found' (i think thats what it said).
I decide to check Outlook Web Access on the server for this mail account.
I log in.. notice that all emails are there.
I go back to check Outlook and now all emails are synchronising correctly. Emails have arrived in Outlook as should be, no other issues.

I checked this out with another user. Exact same issue after migration. No emails in Outlook until the user logs into OWA first (as if to give them a go ahead).

I'm about to do a migration of 30-40 users and dont want to be doing this for each user, simply to get emails to their outlook accounts.

Anyone got any suggestions?
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Can you ask them to create a new profile within Outlook as outlook might still be looking at the old server for the information.
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
It could be because the profile that you have was created with the old server and now the mailboxes havbe moved to the new server and also as the outlook is in cached mode maybe its taking time to update the information about the users movement to the new server.

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MarkMichaelAuthor Commented:
Hmm, that does sound correct.

I'll try it with a fresh new pc. Thanks for the input!
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Your welcome ........... and justt give an update on the issue ?
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Any updates on the issue ?
MarkMichaelAuthor Commented:
Its bank holiday today, so not at work today. I'll let you know soon...
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Cool ... would wait for your update.
MarkMichaelAuthor Commented:

The accounts worked perfectly on this install. The machines were new on the domain so I will have to assume that it was because the profile that Outlook was originally on was based on another domain of the same name. Thanks for your help.
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