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The PST File stores local copies of your calendar events, messages, task data, contacts, etc. The structure of PST Files also makes it possible to export (back up) and import your calendar event details, messages, tasks, contact, etc., to any device. Fix Outlook and Office 365 Errors 2025 Although both file formats serve storage purposes, they differ significantly on the root level. Read the following section to get the complete knowledge about PST and OST differences. The .ost file is synchronized with the items on the server that runs Exchange.  
  
Step 3: Click REPAIR  
  
The Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can't place in their original structure. While working on Microsoft Outlook, have you ever thought about how your email data is stored or managed with OST & PST file format? Knowing the comparison between OST versus PST files will help you to provide a clear understanding of them. Moreover, it helps take suitable steps when opting between the OST and PST files. From the heading above, you can notice two tools were listed. Yes, but they function for a different reason, that'll be mentioned in this section.  
  
  
  
Differences Between Outlook PST and Outlook OST  
  
Outlook Data Files (.ost) are used when you have an Exchange account and want to work offline or use or use the default Cached Exchange Mode. Outlook Data Files (.ost) are always copies of items that are saved on a mail server and don’t have to be backed up like Outlook Data Files (.pst). For this i have mind-blowing software which understands your problems and makes able to read OST file data into PST file without any type of issue. OST to PST is Repair Outlook Profile Online the superb option for your corrupted OST file data many of users self-tested this application and fully satisfied by its services.  
  
Part 1. What Are Outlook PST Files?  
  
A Personal Folders file (.pst) is an Outlook data file that stores your messages and other items on your computer. Because a .pst file is kept on your computer, it is not subject to mailbox size limits on the mail server. By moving items to a .pst file on your computer, you can free up storage space in the mailbox on your mail server. Outlook can be configured to deliver new items to a .pst file, but if you do this, it has several disadvantages. This includes being unable to work with your items when you are accessing it through the web browser or when you are working on another computer.  
  
  
  
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This allows you to use Cached Exchange Mode or to work offline when a connection to the Exchange computer may not be possible or wanted. The .ost file is synchronized with the Exchange computer when a connection is available. The tool repairs & converts complete OST data into the desired format at the user-desired location with full data hierarchy. With its user-centric filters and split features, users can easily manage the converted OST file size. To check out the credibility, explore the software’s trial version.  
  
If you are using a Microsoft Exchange account, your items are usually delivered to and saved on the mail server.To check out the credibility, explore the software’s trial version.Moreover, they do not provide complete control over the process & may disturb data integrity.Although both file formats serve storage purposes, they differ significantly on the root level.ORTry Aryson Outlook PST Repair software to repair your corrupted PST file without any data loss.After you've moved all the items, you can remove the Recovered Personal Folders (.pst) file, including the Lost and Found folder.You’ll not be aware of these changes on the server until you synchronize.  
  
  
  
Outlook Data Files (.pst) are used for POP3, IMAP, and web-based mail accounts. When you want to create archives or back up your Outlook folders and items on your computer, such as Exchange accounts, you must create and use additional .pst files. Typically, when you use a Microsoft Exchange Server account, your email messages, calendar, and other items are delivered to and saved on the server. You can configure Outlook to keep a local copy of modern authentication troubleshooting your items on your computer in an Outlook data file that is named an offline Outlook Data File (.ost).  
  
  
  
  
  
PST File Format is used for POP Accounts, while the OST file format is used for IMAP Accounts. The outlook is extremely popular all around the world because of its strong functions. And we have frequently seen Outlook OST and PST files in our daily work, but don't even give a thought to the difference between Outlook OST and PST. And in today's post, we can explore Outlook PST and OST together. Perfectly repair and recover corrupted Outlook PST & OST files. If you're using an Exchange email account, you can delete the offline Outlook Data File (.ost) and Outlook will recreate the offline Outlook Data File (.ost) the next time you open Outlook.  
  
  
  
A. No, OST files are specific to the computer where they are created and synchronized with a particular Exchange server mailbox. Adhered with specific email accounts and profiles, limiting its accessibility across platforms. Used for offline accessibility to work even in an unstable internet connection. This extraordinary feat (when comparing the size of older PST and OST files to newer ones) also brought to the table more recent problems with the OST and PST Formats.  
  
The Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder. There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't. You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file. The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape. OST and PST files play crucial roles in the functionality of Microsoft Outlook, catering to different needs and scenarios. By understanding the differences and proper management techniques for these file types, users can ensure a more efficient and trouble-free Outlook experience.