Prevent PST Usage Growth PowerShell

Prevent PST Usage Growth PowerShell

Hello,

If you’re planning an Office 365/ Exchange Online migration, you may want to prevent PST usage and growth before their importation in a later migration phase. To do this, you can create a GPO with the Office ADMX files.

You can download the Office ADMX files from Microsoft:

Here-under an example of the GPO settings:

Prevent PST Usage Growth PowerShell - GPO

Prevent PST Usage Growth PowerShell – GPO

You can also flip some registry keys, depending on the Office version installed:

$OutlookVersion = '16'
#PSTDisableGrow
New-ItemProperty -Path "HKCU:\Software\Microsoft\Office\$OutlookVersion.0\Outlook\PST" -PropertyType DWORD -Name PSTDisableGrow -Value 1
#DisablePST
New-ItemProperty -Path "HKCU:\Software\Microsoft\Office\$OutlookVersion.0\Outlook\PST" -PropertyType DWORD -Name DisablePST -Value 1

Outlook version:

  • Outlook 2003 : 11
  • Outlook 2007 : 12
  • Outlook 2010 : 14
  • Outlook 2013 : 15
  • Outlook 2016 : 16

You need to adapt $OutlookVersion to your Office deployment.

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