Exchange Server 2010 Service Pack 1 introduced a new method for exporting mailboxes called Mailbox Export Requests. This new method replaces the previous Export-Mailbox command.
Before we look at how to create a new mailbox export request in Exchange 2010 SP1 there are a few things that you should understand.
Firstly, 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.
Secondly, the mailbox export request is processed by the Client Access server role. Because multiple Client Access servers can exist in a site the request could be processed by any one of them. To ensure that the path to the export PST file is valid for any Client Access server it has to be a UNC path to network share, not a local path.
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