{"id":1140,"date":"2024-03-21T18:20:00","date_gmt":"2024-03-21T12:50:00","guid":{"rendered":"https:\/\/www.webbyacad.net\/blog\/?p=1140"},"modified":"2026-02-19T11:50:14","modified_gmt":"2026-02-19T06:20:14","slug":"easy-use-of-windows-powershell-for-ost-conversion","status":"publish","type":"post","link":"https:\/\/www.webbyacad.net\/blog\/easy-use-of-windows-powershell-for-ost-conversion\/","title":{"rendered":"How to Convert OST to PST Using Windows PowerShell (2026 Guide)"},"content":{"rendered":"\n

Are you trying to access an orphaned or inaccessible Outlook OST file? Converting an Offline Storage Table (.ost) to a Personal Storage Table (.pst) is a common challenge for IT admins and Outlook users. While most believe you need expensive tools, there is a hidden Windows PowerShell trick<\/strong> that can help you extract data for free.<\/p>\n\n\n\n

In this guide, we provide the exact PowerShell commands for OST conversion and explain when you should opt for a professional automated tool to avoid data corruption.<\/p>\n\n\n\n

Can PowerShell convert OST to PST?<\/h2>\n\n\n\n
\n

Technically, PowerShell cannot “convert” the file format directly. Instead, it uses a script to interact with the Outlook COM Object<\/strong> to move data from an OST file into a readable format (like CSV), which can then be imported into a new PST. This method requires Outlook to be installed and the OST to be connected to an active profile.<\/p>\n<\/blockquote>\n\n\n\n

Method 1: The Windows PowerShell OST Conversion Script<\/strong><\/strong><\/h2>\n\n\n\n

Before starting, ensure you have administrative privileges<\/strong> on your PC and that Microsoft Outlook is installed.<\/p>\n\n\n\n

Step 1: Set Execution Policy<\/strong><\/h3>\n\n\n\n

Open PowerShell as administrator and run the following command to allow the script to run: Set-ExecutionPolicy -ExecutionPolicy Unrestricted<\/code> (Type Y<\/strong> and press Enter when prompted for verification).<\/em><\/p>\n\n\n\n

Step 2: Initialize the Outlook COM Object<\/strong><\/h3>\n\n\n\n

Copy and paste the following script to tell PowerShell to interact with Outlook:<\/p>\n\n\n\n

$Outlook = New-Object -ComObject Outlook.Application\n$Namespace = $Outlook.GetNamespace(\"MAPI\")\n$Namespace.AddStoreFromFile(\"C:\\Path\\To\\Your\\File.ost\")<\/code><\/pre>\n\n\n\n
Replace C:\\Path\\To\\Your\\File.ost<\/code> with the actual path to your OST file.<\/em><\/p>\n\n\n\n
Step 3: Export to PST (The Manual Import)<\/strong><\/h3>\n\n\n\n
Once the command runs, the OST file will appear as a “Data File” inside your Outlook application. You must then:<\/p>\n\n\n\n