Exchange Server 2010 Service Pack 1 introduced a new method for exporting mailboxes called Mailbox Export Requests.
1. No accounts are granted the rights to export mailboxes by default. You need to explicitly grant these rights, even to accounts that are organization administrators.
New-ManagementRoleAssignment –Role "Mailbox Import Export" –User Administrator
2. We need to create the network share that will be used as the file path for the exported PST files. All that is required here is a network share that the Exchange Trusted Subsystem group has read/write permission to.
3. With everything configured properly we can now use New-MailboxExportRequest to start the mailbox export.
New-MailboxExportRequest -Mailbox alan.reid -FilePath \\esp-ho-ex2010a\pst\alan.reid.pst
To view the status of the request use the Get-MailboxExportRequest cmdlet:
Get-MailboxExportRequest