Powershell to export mailboxes

I am running the below command. I am poor in powershell.  Is it possible to loop the next command only after completing the first one?  
foreach ($i in (Get-Mailbox)) { New-MailboxExportRequest -Mailbox $i -FilePath "\\ExchPST\September\$($i.Alias).pst" -baditemlimit 50 -acceptlargedataloss }

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Or at-least is t possible to give a time delay (e.g. sleeptimer, start-sleep) between each loop command?
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MAS (MVE)EE Solution GuideAsked:
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SubsunCommented:
Try..
foreach ($i in (Get-Mailbox)) { 

New-MailboxExportRequest -Mailbox $i -FilePath "\\ExchPST\September\$($i.Alias).pst" -baditemlimit 50 -acceptlargedataloss 

while ((Get-MailboxExportRequest -Identity $i | ? {$_.Status -eq “Queued” -or $_.Status -eq “InProgress”}))  { sleep 60 }
}

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Above command will wait until the mailbox export request get completed. If you just want to insert a 60 sec delay after once user export, then use the following code..

foreach ($i in (Get-Mailbox)) { New-MailboxExportRequest -Mailbox $i -FilePath "\\ExchPST\September\$($i.Alias).pst" -baditemlimit 50 -acceptlargedataloss;Start-Sleep 60}

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MAS (MVE)EE Solution GuideAuthor Commented:
This is the error on the first command, Is it a single line command ? I tried both
A positional parameter cannot be found that accepts argument 'while'.
    + CategoryInfo          : InvalidArgument: (:) [New-MailboxExportRequest], ParameterBindingException
    + FullyQualifiedErrorId : PositionalParameterNotFound,New-MailboxExportRequest

Second one is working
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SubsunCommented:
First code should be used as it is, don't combine the commands and make in in single line.. If you want to make it in single line then use ; (semicolon) to separate the commands.

foreach ($i in (Get-Mailbox)) { New-MailboxExportRequest -Mailbox $i -FilePath "\\ExchPST\September\$($i.Alias).pst" -baditemlimit 50 -acceptlargedataloss ;while ((Get-MailboxExportRequest -Identity $i | ? {$_.Status -eq “Queued” -or $_.Status -eq “InProgress”})) { sleep 60 } }

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MAS (MVE)EE Solution GuideAuthor Commented:
Name                                                                 Mailbox                                                                  Status
----                                                                         -------                                                                      ------
MailboxExport                                  Domain.com/users/Joseph Scaria                                    Queued
Cannot process argument transformation on parameter 'Identity'. Cannot convert the "Joseph Scaria" value of type "
Microsoft.Exchange.Data.Directory.Management.Mailbox" to type "Microsoft.Exchange.Management.RecipientTasks.MailboxExpo
rtRequestIdParameter".
    + CategoryInfo          : InvalidData: (:) [Get-MailboxExportRequest], ParameterBindin...mationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,Get-MailboxExportRequest

It created the first request and showing this error.
If I am not mistaken identity is supposed to be "Joseph scaria\mailboxexport"
That is why it is showing error
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SubsunCommented:
I am unable to test it right now.. What if you try..
foreach ($i in (Get-Mailbox)) { New-MailboxExportRequest -Mailbox $i -FilePath "\\ExchPST\September\$($i.Alias).pst" -baditemlimit 50 -acceptlargedataloss ;while ((Get-MailboxExportRequest -Identity $i.alias | ? {$_.Status -eq “Queued” -or $_.Status -eq “InProgress”})) { sleep 60 } }

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Or
foreach ($i in (Get-Mailbox)) {$move = New-MailboxExportRequest -Mailbox $i -FilePath "\\ExchPST\September\$($i.Alias).pst" -baditemlimit 50 -acceptlargedataloss ;while ((Get-MailboxExportRequest -Identity $move.Mailbox | ? {$_.Status -eq “Queued” -or $_.Status -eq “InProgress”})) { sleep 60 } }

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MAS (MVE)EE Solution GuideAuthor Commented:
I managed to get it done by this command. Thanks a lot.
foreach ($i in (Get-Mailbox)) { New-MailboxExportRequest -Mailbox $i -FilePath "\\ExchPST\September\$($i.Alias).pst" -baditemlimit 50 -acceptlargedataloss ;while ((Get-MailboxExportRequest -mailbox $i | ? {$_.Status -eq “Queued” -or $_.Status -eq “InProgress”})) { sleep 60 } }

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MAS (MVE)EE Solution GuideAuthor Commented:
Thanks
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