Difference Between OST and PST File Format – Know Here

Christopher Plummer | August 22nd, 2024 | Outlook

Summary: If you have ever used Microsoft Outlook, you may have come across two common file formats: PST and OST. If you’re confused about the differences between these two file types and want to clear things up, read this blog thoroughly. Our guide explains what PST and OST files are and highlights the key differences between them. So, let’s dive into the details without further delay.

What are OST File and PST Files?

Microsoft Outlook is an email client designed to help users send and receive emails, manage their schedules, and organize tasks efficiently. Within Outlook, emails and other data are stored in two file formats:

  • PST
  • OST

Let’s know about these file formats in more detail;

OST (Offline Storage Table)

This file format saves a local copy of your Outlook data on your computer. It is typically used with Exchange, Office 365, or Outlook.com accounts. Even when you’re not connected to the internet, you can edit emails, save drafts, and make changes to contacts. Once you’re back online, your changes are automatically synced with the server.

PST (Personal Storage Table)

A PST file stores copies of emails, calendar events, contacts, and more directly on your system. It is primarily used with non-Exchange email accounts like POP3 or IMAP. A PST file can be easily backed up, exported, or imported into another Outlook installation, making it ideal for moving data between devices or services. Additionally, it can be password-protected to secure your data.

After this, we will discuss the major differences between these two file formats.

What is the Difference Between .PST and .OST in Outlook?

  • Creation: OST stands for Offline Storage Table, which is created by Outlook and the server to store offline copies of your emails and other data. PST stands for Personal Storage Table, and it’s not created by Outlook or the Exchange server. Instead, users manually create PST files to store emails, contacts, calendars etc.
  • Offline Access: You can work with an OST file even when you’re offline, and once it reconnects to the Exchange server, it automatically syncs with your mailbox. Whereas, PST files don’t sync with a server.
  • Encryption: OST files are encrypted by default using a MAPIEntryID GUID key, which means they can only be accessed using the original Outlook profile. In contrast, PST files are not encrypted by default, and anyone can copy or move them to another computer or Outlook profile to access the mailbox data.
  • Backup: PST files are commonly used for backups and migrations because they’re easy to open, access, and import into any Outlook account. You can open multiple PST files at the same time without any issues.
  • Usage: OST files are only compatible with Microsoft Exchange Server, whereas PST files can be used with a variety of email services.
  • Repair Utility: To fix minor issues, the built-in Scanpst.exe tool is used to repair PST files, and Scanost.exe is used to repair OST files.

We have now covered the basic differences between OST and PST file formats. We hope you have a clear understanding of these differences.

Now, we will discuss why PST files are generally preferred by users. It’s due to the following advantages:

Benefits of PST Files Over OST Files

  • PST files can be transferred to a local computer, whereas OST files must be synchronized separately using a server.
  • PST files can be uploaded to other email services, but OST files can’t be moved unless they’re converted first.
  • Although PST files can be automatically backed up and restored, OST files still require server synchronization.

Pro Tip: How to Convert OST to PST in 4 Easy Steps?

If you are in need to try a different file format to favor PST files over the OST files. Use Advik OST to PST Converter to export emails from Outlook data file in PST File Format. This tool allows you to selectively choose required OST Files or Outlook mailboxes as per their need and choice. PST files are very easy to access in comparison to OST Files and by using this tool. It can even export large, corrupt, inaccessible Outlook Data Files to 30+ different file formats.

Final Words

We hope this blog has helped clarify the differences between OST and PST files in Microsoft Outlook. While both formats are essential for managing Outlook data, PST files are often preferred for backups and transfers due to their flexibility and ease of use. For those needing to switch between file formats, tools like Adviksoft offer a quick and efficient solution.