Couldn't Connect to The Source Mailbox New-Mailboxexportrequest

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PowerShell shows error couldn't connect to the source mailbox while running New-MailboxExportRequest command to export all exchange server mailbox items to outlook PST file. http://goo.gl/rhDzXe Access to path denied error while trying to export exchange server mailbox items. the given path might be wrong or write protected. The detail description of the error is described with reason and the solution to the error "couldn't connect to the source mailbox" when try to run export request command. This is also the solution to the following errors: - couldn't connect to the source mailbox - couldn't connect to the source mailbox new-mailboxexportrequest - new mailbox export request access denied - new-mailboxexportrequest couldn't connect to the source mailbox - new mailbox export request exchange 2010