How to convert OST to PST

Josh Smith

Aid4Mail can quickly and accurately convert an OST file to a PST file with ease. Aid4Mail will preserve the email attachments, metadata, folder structure and can include hidden system folders found in the OST file.

Aid4Mail also provides additional options to customize the output of the emails in the PST file. Some of those options include:

  1. Ability to customize the folder structure of the emails when converting to the PST file.
  2. Limit the size of the PST file being created. If the limit is reached, a new PST file is incremented and remaining emails are converted to the new PST file.
  3. Create a new base folder in the PST file where all the contents of the OST file will be converted to.
  4. If you need to add emails to an existing PST file, Aid4Mail can append or add emails from an OST file to a PST file you already have.
  5. Filtering options to select only the folders you need to convert from the OST file. Of course if you need to convert all the emails from the OST file (even hidden folders inside the OST file), Aid4Mail has you covered as well.

Aid4Mail provides you with the option to convert OST to PST without Outlook being installed on the machine. By default, Aid4Mail will use Microsoft Outlook as it is more reliable and we are experts with Outlook and the underlying MAPI technology. If you don’t have MS Outlook installed on the machine, simply use our alternate method for the OST to PST file conversion.

Also to be clear, Aid4Mail has no issues when converting large OST files. We thrive on being able to provide our clients with a product that can process any size OST file. You can even process multiple OST files concurrently at the same time to speed up a project that might entail converting multiple OST files to PST files.

With the Aid4Mail Investigator license, you have access to Aid4Mail’s searching capabilities. You can add searches based on dates, keywords or even using custom scripts via python. Aid4Mail can search entire emails including the header, body and attachments. Aid4Mail can even search files contained in zipped files (that are attachments). Aid4Mail supports search lists, boolean operators, proximity searches, native pre-acquisition searches (for certain file formats) and more.

Although this article covers converting Outlook OST files to PST, Aid4Mail is far more than just an OST to PST conversion program. Aid4Mail supports many additional file formats like OLM, PST, MSG, Outlook Profile,MBOX, EML, Apple Mail, Maildir, Google Takeout, Google Vault exports, Mimecast exports, IMAP accounts and more. You can also convert OST files to other file types like MSG, EML, MBOX, CSV, TSV, XML, HTML and Plain text. You can find more information here.

Now let’s go through the steps needed to convert an OST file to a PST file using Aid4Mail.

  1. Under “Source” select “OST file” and then specify the location of your OST file. Normally by default, OST files are found here: C:\Users\USERNAME\AppData\Local\Microsoft\Outlook\OST to PST source format
  2. Under “Target” select “PST file” and then provide the location of where you want to save the PST file that Aid4Mail will create. Select PST as Target and provide a location to save the PST file.
  3. Next you can specify a specific folder inside the PST file where the OST file data will be saved by adding the folder name under “Location in PST file”. I set mine to OST data.Location in PST file
  4. Most likely you will want to keep the folder structure the same (as it is in the OST file). If you need to limit the size of the PST file being created, use the “Limit PST file size:” option. I set mine to 50GB as that is the default size set by Microsoft Outlook.Limit PST file size
  5. Finally under “Filter”, you can use the “Folder selection” tab to select only the folders you want to process.Filter folders
  6. After all your settings are set to your preference, click on “Run” to convert the OST file to a PST file.

Run conversion

After Aid4Mail finishes with the conversion, you will have a full report on all the emails and folders processed. Under the Progress log tab, you will find a full report on the settings used and see every email that passed through Aid4Mail during the conversion. If there were any errors, Aid4Mail will alert you of these under the Error log tab. To see the emails and folder structure in the PST file, simply import the PST file in Outlook.

Here are some benefits of using Aid4Mail to convert OST files to PST:

  • Aid4Mail is an on-premises program meaning all the data you process from an OST file is completed locally on your machine.
  • Aid4Mail is developed in-house and we use as little 3rd party code or DLLs as possible. This means that if you have any issues, we have control over our program and are able to troubleshoot quickly. Some of our competitors use almost entirely 3rd party code or DLLs. They most likely will not be able to resolve issue or it will take extremely long as they rely on other products to fix the issue.
  • Convert as many OST files or other email data as you need! All Aid4Mail licenses allow you to process as much mail data as you need during the validity period. Some of our clients process Terabytes of data every month!
  • With our user friendly user interface, converting an OST file takes only a few clicks and the conversions are quick and accurate.
  • Our customer support is the best and we make sure to get back to you as quickly as possible to make sure you accomplish your task.

As we want potential clients to have full confidence in purchasing and using Aid4Mail, we provide a free trial version. You can use the trial version to run your own tests on your OST Outlook data files. You can download our free Aid4Mail trial version here.

Our 20 years of expertise in the field of email processing make us the best OST to PST converter tool on the market.

For information on our different licensing options and pricing, click here. 

If you have questions about processing OST files or how to use Aid4Mail, please do not hesitate to get in touch with us. We are always happy to assist and make sure you have all the information you need to move forward and accomplish your tasks using Aid4Mail.

If you experience any issues, please don’t hesitate to contact us.

If you would like to buy an Aid4Mail license, please visit the Aid4Mail website.

About Fookes Software

Fookes Software Ltd
La Petite Fin 27
1637 Charmey (en Gruyère)

For over 25 years we have been developing award-winning tools and productivity software. We also have more than 20 years of expertise in the field of email processing and analysis.

Our clients include Fortune 500 companies, government agencies, law firms, universities, and professionals specializing in e-discovery and forensics from around the world.

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