Export a Mailbox to PST
New-MailboxExportRequest -Mailbox user@domain.org -FilePath “\\path\user.pst”

Get Mailbox Export Requests
Get-MailboxExportRequest | Get-MailboxExportRequestStatistics

Remove Mailbox Export Requests
Get-MailboxExportRequest | Remove-MailboxExportRequest

Export Mailbox to PST
New-MailboxExportRequest -Mailbox user@domain.org -FilePath “\\path\user.pst”

Import Mailbox to PST
New-MailboxImportRequest -Mailbox user@domain.org -FilePath “\\path\user.pst”

Get Mailbox Import Requests
Get-MailboxImportRequest | Get-MailboxImportRequestStatistics