Learn How to Open a PST File on Microsoft 365.

Written by Christine Santiago  »  Updated on: June 07th, 2025

Learn How to Open a PST File on Microsoft 365.

When you switch from Microsoft Outlook on your computer to Office 365 in the cloud, many are concerned about the way to use their old PST files. They include emails, a list of contacts, scheduled appointments and various mailbox information.

Office 365 system does not make it possible to open PST files from the internet directly, so you should migrate your data to your Office 365 mailbox. Using a "PST email file converter" helps simplify the work and guarantees you get your data with no problems.



Importing a PST File Manually with Outlook

Bringing your PST files to Office 365 manually is possible with the help of Outlook on your desktop. The process is described in the following steps.

  • Access Outlook and check you have signed into your Office 365 account.
  • Head to the File tab and choose Import & Export.
  • Open the file you want to convert and then proceed by clicking Next.
  • Go ahead and click on Outlook Data File (.pst).
  • Access your PST file, then decide how the program should manage duplicate emails.
  • Select which folders or data to include in the process of moving your files.
  • Click Finish. If the file is locked with a password, you’ll be asked to put in the password when opening it.

Once the import is finished, all chosen emails, contacts and calendar events will be displayed in your Office 365 mailbox.


There are some problems with the Manual Import Process

While importing PST files manually is suitable for small amounts of information, it still has some significant issues.

  • Outlook performance slows down, or it may crash when you have files that are larger than 50GB.
  • It is necessary to repair corrupted PST files before importing them.
  • In addition, to manage password-protected files, you must go through more steps.
  • Manually uploading files is inefficient when working with many users and a vast amount of data.
  • Auto importing of products often requires administrative access.


Using a PST converter tool is a more innovative way to handle your information.

With a PST email file converter, overcoming these issues will be much easier. They become very useful when you have many PST files or a single large one or when some data is broken and can't be opened manually.
The BLR PST converter tool helps you shift your PST file to Office 365, so you don't have to resort to manual steps.

The reasons why a PST file converter tool is useful

  • Corrupted PST files are automatically fixed before the start of conversion.
  • Allows users to import data in larger amounts, which is more efficient and time-saving.
  • It ensures that all necessary components, such as attachments, calendar items and tasks, are maintained.
  • The interface is user-friendly, making the entire process easy.
  • Secures and guarantees the accuracy of data as it is transmitted.

Choosing this method makes the move from PST to Office 365 easier and more organized.


A Guide to Using the PST converter tool

  • Download the converter software from the website and set it up on your computer.
  • Select the PST file you want to move and check what it contains.
  • Select Office 365 as your final place when importing the data.
  • Type your Office 365 log in information to establish the connection.
  • Use filters if you want to search by date, folder or type of item.
  • Start transferring your application and continually track progress until it’s fully completed.

Following this process helps organizations and users protect their data and finish PST transfers without interruptions.

Click on this link to download the BLR PST converter tool and begin the conversion now.


Conclusion

If you are changing from the Outlook desktop version to Office 365, you must manage your PST files. Manual imports are sufficient for small data, but they are not enough when the data is large or complex to import. Moving your data from PST to Office 365 using a PST email file converter is safer and more reliable than other methods, letting you use all of your emails, contacts and calendars after the conversion.

It's important to copy your PST data before you start transferring it in case you lose anything.


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