Convert Ost To Pst Powershell

Learning has never been so easy! Microsoft Outlook stores mailbox data in an Outlook data file. Based on the email account type, Outlook may create an Offline Storage Table (OST) file or Personal Storage Table (PST) file to store a synchronized copy of mailbox items, such as emails, contacts, attachments, etc.

on the local system. Offline Outlook OST file allows Outlook users to access their mail items even when the system is offline or the server is temporarily unavailable. However, it is encrypted by default with MAPIEntryID GUID key and thus, can't be accessed or imported into other Outlook profiles. On the other hand, PST is a portable Outlook data file format, which is also used for backup and migration of mail items from one Outlook profile to another.

PST files can be easily opened and imported into any Outlook account on both Outlook for Windows and Outlook for Mac. You can also import a PST file into live Exchange Server or Office 365 (Microsoft 365).

Step 4: Professional Solution - To convert Orphaned OST file in PST

Thus, if you need to import or migrate mail items from an Outlook OST file to another computer, Outlook profile, live Exchange Server, or Office 365, you need to convert your OST file into PST format.

OST to PST conversion is also required when the OST file enters the orphaned stage or becomes inaccessible due to reasons, such as:. Deleted mailbox profile from the Exchange server2. Sudden system shutdown or crash3.

Large OST size (oversizing)4. Virus or malware intrusion5. Faulty or incompatible add-ins. Exchange administrators may also need to convert OST to PST to restore an accidentally deleted or removed mailbox on the server.

In this guide, we’ll be discussing free methods to convert OST to PST format in Outlook 2010, 2013, 2016, and 2019. ** Free Methods to Convert OST to PST file**.


you can use Outlook Import Export Wizard or a third-party OST to PST converter software.

Outlook Import Export Wizard allows Outlook users to export mail items and contacts to PST and CSV formats.

  1. Thus, the wizard can export the mail items from their Outlook OST file to PST format.
  2. **In Outlook 2010,**. - Click on the **File > Info** and then select '**Options.'
  3. **- Click '**Advanced**' and then select '**Export**' to open the Outlook Import Wizard.
  4. **In Outlook 2013, 2016, or 2019**,.
  5. Select the folder you want to export or select the whole account.

    Make sure Include subfolders is selected

  6. Click Next and choose a location for the export and click finish

    When the export is finished you will have a PST file that you can use to import the mail into another account.

4 Steps total

- Navigate to **File > Open & Export > Import/Export**. This opens the Outlook Import Export Wizard. - Select **Export to a file** from the **Import and Export Wizard** window and click **Next**.- In Export to a file window, choose **Outlook Data File (.pst)** and click **Next**.- Choose the mail folders and items you want to convert to PST and check the '**Include subfolders**' checkbox.

Then click Next.- Click '**Browse**' to select a save location to save the converted PST file and click '**Next**.- Click **'Finish**. Then enter a password or click '**OK**' without entering the password. This will convert all the emails and other mail items from the Outlook OST file to an Outlook importable PST file format.

**Caution:** If the OST mailbox is large, export mail data into multiple PST files. For this, you can manually export specific mail folders and then repeat the steps to export the remaining folders.

Why need conversion to PST file format?

This will help avoid PST file corruption due to its large size. You may also move emails from OST to a PST file. For this, you need to create a new PST file using Outlook options. The steps are as follows:. - Click **New Items > More Items > Outlook Data File….**- Choose a location, enter the PST file name, and click ‘**OK**’ to create PST file.- Now select all mail items from the OST mailbox you want to convert to PST and drag-drop them to the newly created PST file.

You can also enable the Archive Settings to save mail items in a separate PST file automatically. The steps are as follows:.


Click on **File > Options > Advanced**.2. Click the “**Auto Archive**” button.3. Enter the **number of days** for which you want to run the **Auto Archive**.4.

Click ‘**Browse**’ to choose a save location for the resultant archive PST file. Then click “**OK**” to continue. From now on, the mailbox items will be saved to the PST file automatically.


To overcome the above limitations, you can use a professional OST to PST converter tool, such as [Stellar Converter for OST](

  • The tool comes in handy when you can't access the Outlook account or open the Import Export wizard.
  • It allows you to convert single or multiple inaccessible or orphaned Outlook OST files to PST format.
  • You may also export the mailbox items from the OST file directly to an existing Outlook profile, Office 365, live Exchange, or other file formats.
  • The software is free to download, and the demo version allows you to convert and save up to a few mail items per folder.
  • To save all mailbox items to PST or other formats, you can activate the software using a valid activation key.
  • In addition, the software also recovers accidentally deleted emails during OST to PST conversion.

The steps are as follows:. Download, install, and launch **Stellar Converter for OST** software and choose the OST file. The Default Location displays OST files located at the default location.

Use the '**Choose Location**' tab to select the OST file manually. Then click '**Convert**.' After conversion, the software displays an enhanced preview of all mail items from the OST file.

Click on a mail item to preview and select all the mail items from the scanned OST file.3.

Method 1: Export mailbox as a PST file

Click the '**Save Converted File**' option and then choose the '**PST**' option.4. Click '**Browse**' to choose a save location and then click '**OK**.' This will save the converted OST file to Outlook importable PST format. To export the OST directly to an existing Outlook profile, live Exchange, or [Import OST to Office 365]( , you need a Technician version of the software (free demo version available).

Although Outlook Import Export Wizard converts OST to PST by exporting the mailbox items from your Outlook profile to PST format, it's not recommended when you need to convert multiple or large OST files. Also, it does not provide an option to split oversized OST files into smaller PSTs.

In addition, it exports all mail items in a single PST, which can lead to integrity issues and corruption. Using an OST to PST converter tool, you can convert large-sized OST files and inaccessible and orphaned files to PST format.

You can also export the OST file directly to an existing Outlook profile, Office 365, or live Exchange.

Convert OST to PST without Exchange profile or server connectivity

You can download the software for free to convert OST to PST. Published: Aug 09, 2021 · Last Updated: Dec 22, 2021 . If the need to convert Outlook OST file to PST format arises, There is no PowerShell commands that can read OST files or convert OST to PST, the problem is that Microsoft never really exposed OST file format in .NET classes, which means PowerShell's got nothing to build on but there are some manual methods and third party tools you could potentially use.

One such trustworthy tool is Stellar Converter for OST. Outlook data files – OST and PST – cater to different needs of home and professional users.


Both serve entirely different purposes, yet many times, situations demanding the conversion of OST files to PST format arise. What are these situations and if faced with them, what methods are available to users to perform the said conversion in a risk-free and hassle-free manner?

Through this article, we are attempting to provide a concise answer to these questions. Why convert OST to PST? While OST allows users to work on their mailboxes even when they aren’t connected to Exchange, this file is limited by several restrictions which prompt users to convert it to PST format so that the data stored within it can be accessed directly.

Some of the key reasons why users want to convert OST to PST include:. · Exchange server crashing unexpectedly restricting direct access to OST file data.

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