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What is the best way to migrate Exchange 2003 mail to a new exchange 2003 server in a different forest.

Posted on 2009-07-13
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Last Modified: 2012-05-07
I want to migrate mail from an existing Exchange 2003 server that resides in a Windows 2000 domain to a new Exchange 2003 server that resides in a new Window 2003 domain. If I use exmerge and migrate mail to .pst files, the users cannot forward or reply to emails within the organization.    The new exchange 2003 server is configured to use the same email alias format of the old one.  My goal is to migrate users mailboxes to .pst files and then configure their new Outlook client to access these .pst files.  It doesn't seem to allow user to forward or reply to any of the internal emails in the .pst file.  
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Question by:iopadmin
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Expert Comment

by:muzzi_in
ID: 24844273
one of the easiest method is import email into pst using Exmerge and export onto new mailbox using the same tool,
or One of the many ways is to use "Exchange Migration Wizard" which is installed by default under Exchange program group. One thing to keep in mind is SIS is lost during cross forest mailbox move. Its as simple as exporting mailboxes to PST file using exmerge and importing them in new forest.

If you have a time constrain you can consider following steps.
1. Move the accounts with SID history to target forest.
2. Get the Exchange server up and running in target forest with blank mailboxes.
3. Export the mailboxes to .PST files in source forest and copy them over to target server.
4. Import the PST files using exmerge in the new mailboxes.
This will keep your downtime at the lowest possible as users will be able to send/receive emails during migration.


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by:muzzi_in
ID: 24844459
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by:muzzi_in
ID: 24860274
any update ?????????
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Author Comment

by:iopadmin
ID: 24860470
Working it right now.  I just successfully used Exmerge to export my mailbox from our existing exchange server and then imported successfully in to the new exchange server.   It seems to be working fine as I have all my email.  In fact, it is hard to tell the difference between the two Outlook accounts!  I have not yet configured our firewall to allow our new exchange server to deliver externally yet so I am unable to fully test.  I am hoping to get this done next week.  I want to test if users will be able to reply to old messages that were imported from the old server as I suspect that may be an issue.  But until I have the new Exchange server configured on our firewall I won't be able to really test it.  Unfortunately, I won't be able to get it configured until next week.  I will keep you posted on my progress.
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Expert Comment

by:muzzi_in
ID: 24860614
In order to reply old PST emails, you need to add X400 and legacyexchangeDn value in all users properties, you can use Admodify tool to add the same.
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Author Comment

by:iopadmin
ID: 24860652
I was just researching how to do this.  Can you give me a little more step by step detail on how to do this?
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Author Comment

by:iopadmin
ID: 24916648
I used Exmerge to export my mailbox to a .pst file from our existing exchange server, I then imported the pst file into the new exchange server.  I am getting as stated above the NDR Error 5.1.1 that states the email account does not exist in the organization this message was sent.  Based on the above resolution for this problem, I  used ADSI Edit and retrived the legacyexchangeDN value from test account on the existing exchange server.  I then went into the user properties of my test user AD account on the new exchange server; went to the email addresses tab and added a custom email address (type x500) and entered the legacyexchangeDN value as the email address.  Am I missing a step here as I still am getting the NDR Error 5.1.1
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iopadmin earned 0 total points
ID: 24924805
Does anybody have any feedback on the above issue?  Still stuck.  
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Expert Comment

by:muzzi_in
ID: 24944580
you need to use ADmodify tool to add the above value into the users accounts.,
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