This i a Guide to export mailboxes from Exchange 2010 database to a pst files.
Frist, You will have to be SP3 intalled

  • grant de right: New-ManagementRoleAssignment –Role “Mailbox Import Export” –User Administrador
  • Create a share with correct permissions \\server\pst
  • start the request: New-MailboxExportRequest -Mailbox name -FilePath \\server\pst\name.pst
  • check Status: Get-MailboxExportRequest
  • Delete the MailboxExportRequest: Get-MailboxExportRequest | where {$_.status -eq “Completed”}