Export
New-MailboxExportRequest -Mailbox user_name -FilePath \\exdag01\c$\export\user_name.pst
Check Export Status
Get-MailboxExportRequest | Get-MailboxExportRequestStatistics
Import
New-MailboxImportRequest -FilePath \\exdag01\c$\export\user_name.pst -Mailbox user_name
Check Import Status
Get-MailboxImportRequest | Get-MailboxImportRequestStatistics | select filepath, status
Clear Completed Export Request
Get-MailboxExportRequest | where {$_.status -eq "Completed"} | Remove-MailboxExportRequest
Clear Completed Import Request
Get-MailboximportRequest | where {$_.status -eq "Completed"} | Remove-MailboxImportRequest