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Cannot access user's calendar or send mail to new mailboxes in Exchange 2010 from migrated mailboxes

I just migrated  users from a Exchange 2003 environment to a Exchange 2010 SP1 server. All went well except that I had two mailboxes that couldn't be migrated because of message corruptions. I exported the mailboxes to a pst file and then deleted the old mailboxes. I then created them on the new 2010 server, reconfigured the clients and imported the content without issue.

Now I have a unique problem, some users on the older desktops cannot access the shared calendars for those new mailboxes nor can they send email to those 2 new mailboxes. Yet everyone on our new RDS server environment has no issues with either. Any ideas?

Here are the errors we are getting:
1. When emailing this person from the older systems "The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk."
2. When trying to access the shared calendar from the older clients I get the image below. Calendar error
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safeharbor
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safeharbor
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1 Solution
 
PradeepCommented:
check whether outlook is running in cached mode.
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safeharborAuthor Commented:
No difference. It seems like the new 2010 mailbox has different properties than the migrated 2003 mailboxes
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safeharborAuthor Commented:
The solution that solved this issue was to delete the old exchange settings on the desktops and create a new exchange account. Once this was done, everything worked.
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safeharborAuthor Commented:
We were able to internally troubleshoot the issue.
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