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Migrating from Exchange 2003 to Office365...multiple domains in 2003 Exchange, best way to move just one?

Posted on 2014-07-17
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An Exchange 2003 Server hosts email for multiple email domains. We are moving one of the domains to Office365.  I will call it @a.com. There is a tool in the Exchange Admin Center for batch migration, but it looks like it will grab all domains we have on our server. I don't see a way to move only @a.com while leaving @b.com. I know it is an option to export all mail items for each user to an Outlook pst and import them into the new mailboxes, but I am hoping there is a better way.
@a.com is the only email domain on the server that uses public folders. Is there a best way to migrate all of those? I understand migrating those by way of a pst may take a long time for all the items to show up in Office365, so is it better to move them to subfolders of a shared mailbox?
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Question by:jjh2010
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suriyaehnop earned 2000 total points
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If not mistaken in EAC, you have an option to use batch migration with CSV file.

http://technet.microsoft.com/en-us/library/dn170437(v=exchg.150).aspx
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