How to Convert OST to PST in Office 365

If you're trying to open or move your Outlook emails from one place to another, you may have come across two important file types: OST and PST. This guide will help you understand what they are and how you can easily convert OST to PST in Office 365 using simple steps and trusted tools like OST Converter Tool, OST to PST Converter Software, and OST File Converter.

Let’s begin by understanding what OST and PST files are.

What Is an OST File?

An OST file is a special file that Outlook creates when you use it with Microsoft Exchange, Office 365, or IMAP accounts. It allows you to work even when you are not connected to the internet. All your emails, calendar items, and contacts are stored in this file.

Think of it like a notebook where Outlook writes everything when you're offline. Once you're back online, Outlook syncs everything with the server.


What Is a PST File?

A PST file is another type of Outlook file. It stores your emails, calendar, and other Outlook data—but unlike the OST file, the PST file is portable. That means you can save it on a USB or move it to another computer.

In simple words, PST files are like carry bags for your emails.

Why Convert OST to PST?

There are many situations where you might need to convert an OST file to PST format:

  • You can’t open Outlook and want to access old emails.

  • Your Outlook account is deleted or no longer working.

  • You are moving to a new computer or Office 365 account.

  • You want to back up your Outlook emails.

  • Your Exchange Server crashed or got corrupted.

To solve all these problems, converting OST to PST is the best and safest option.

Can You Convert OST to PST Manually?

Yes, you can convert OST to PST manually if your Outlook is working and connected to your account. Here’s a simple way:

Manual Steps to Export OST to PST (if Outlook is working):

  1. Open Microsoft Outlook.

  2. Click on File > Open & Export > Import/Export.

  3. Select Export to a file, then click Next.

  4. Choose Outlook Data File (.pst) and click Next.

  5. Pick the folder you want to export (e.g., Inbox).

  6. Browse where you want to save the PST file.

  7. Click Finish.

This will create a PST file from your Outlook data.

But this method won’t work if:

  • Your Outlook doesn’t open.

  • The OST file is orphaned or corrupted.

  • You no longer have access to the original account.

For these cases, you need a professional OST Converter Tool.

What Is an OST Converter Tool?

An OST Converter Tool is a software that helps you convert your OST files to PST format without needing Outlook or Exchange access.

It works even if:

  • The OST file is damaged.

  • You don’t have Outlook installed.

  • The original mailbox or profile is deleted.

These tools are very helpful, especially when manual methods fail.

Benefits of Using an OST Converter Software

Here’s why many people trust OST Converter Software:

✅ Easy to Use – No technical skills required. Just a few clicks.
✅ Safe – Keeps your emails, attachments, contacts, and folders intact.
✅ Fast – Converts large OST files in just a few minutes.
✅ Flexible – Converts OST to PST and many other formats like EML, MBOX, MSG, etc.
✅ Reliable – Works with all versions of Outlook and Windows.

How to Use OST File Converter to Convert OST to PST in Office 365

Here’s a step-by-step guide to using an OST File Converter:

Step 1: Download and Install OST Converter Tool

Step 2: Add Your OST File

  • Open the OST Converter Tool.

  • Click on “Add File” or “Browse” to select your OST file from your system.

Step 3: Scan and Preview

  • The tool will scan your OST file.

  • You can preview your emails, contacts, calendar, notes, etc.

Step 4: Choose Output Format (PST)

  • Select PST as the format you want to convert to.

Step 5: Start the Conversion

  • Click on “Convert” or “Export” to begin.

  • Save the PST file to your desired folder.

Step 6: Import the PST to Office 365

Once you have the PST file, follow these simple steps to upload it to Office 365:

  1. Open Outlook with your Office 365 account.

  2. Go to File > Open & Export > Open Outlook Data File.

  3. Browse and open the PST file you just created.

That’s it! You have successfully converted OST to PST and added it to your Office 365 account.

Things to Keep in Mind

  • Always take a backup of your OST file before starting.

  • Use trusted OST Converter Tools to avoid data loss.

  • Check whether the tool supports your Outlook version.

  • Make sure your system has enough space to save the converted PST file.


Final Words

Converting OST to PST in Office 365 is not hard if you know the right method. While manual ways work in some situations, they don’t cover all cases. That’s why using a professional ​OST Converter Software or OST File Converter is the best choice.

These tools make your job easier, faster, and safer. Whether you’re a student, office worker, or IT admin, converting OST files doesn't have to be confusing anymore.

So, if you're stuck with an OST file and want to access your emails in Office 365, try a good OST Converter Tool today and save your time and effort.



Location: Sewak Park, Dwarka, Delhi, India

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