How to Import OST files into Office 365?

If you’re looking for a quick and secure way to import OST files into your Office 365 account, you’re at your destination. In this post, we will go over why a user wants to import OST files into Office 365 and how they can do it without any data loss problem.

OST or Offline storage table is a file type that MS Outlook uses to save to store data of users’ profiles. With OST files users get the facility to access data locally.

Office 365 is a cloud-based service that is launched by Microsoft. With this service, Microsoft has shifted all Office applications such as MS Word, PowerPoint, Excel, Outlook, to the cloud. Now a user can easily access their MS Office application from Cloud applications.

After its release, many users are want to migrate from Outlook desktop to Office 365.

Main Reasons to Import OST file to Office 365

Some of the most common reasons why people want to import OST files into Office 365 accounts:-

  • To free up some extra space from local drive
  • For accessing emails and other Outlook data from web browsers.
  • Organizational changes allow for the migration from Outlook desktop to Office 365.

Automated Method To Import OST files into Office 365

Users can not directly Export OST files to Office 365 accounts using Automated Tools. The best software that can accomplish this task is PassFixer OST Converter Software. With the help of this tool, users can export single or bulk OST files to Office 365 account at once without losing any data. It can also allow to Export of data from corrupt or damaged OST files to Office 365.

Features of OST to Office 365 Converter

  • Easily import single and bulk OST files into Office 365 accounts at once.
  • Export OST files in multiple files formats such as:- PST, vCard, HTML, EMLX, Zimbra, MBOX, MSG, EML & ICS.
  • Recover OST file data while keeping all its inner data and email properties such as bcc, to, from, and subject.
  • No restrictions on the size of the OST file for the import process.
  • It can show a live preview of the OST file’s inner data before starting the conversion process.
  • Support all windows versions like- 10, 8, 7, Vista, XP.
  • Offers mail filter function to export emails of specific dates from OST to Office 365.
  • All users can its a free trial version which can help users to export up to 25 mailbox items from each OST folder for free.

Steps To Import OST files into Office 365

  • On a Windows system, run PassFixer OST Converter Software.
Main screen OST Converter
  • Select the radio button “MS Outlook OST file” from the Add Source File section.
select source file
  • Choose a file selection option from the choices:
    Add a single OST file
    Add several OST Files
  • When you’ve selected the OST file from its location, click the Next tab.
single ost file selection
  • The tool will now extract and load all OST file’s inner data.
scan/load OST file
  • Select the necessary mailbox folders from the preview screen and click the “Import to cloud” tab.
preview OST emails
  • The tool will now open a new window simply select the Import to Office 365 option.
  • Log in using Office 365 user credentials by entering “Email ID” and “Password.”
  • After the login process hit on the “Convert” to begin the OST to Office 365 Migration process.


In this article, we have explained the best technique for importing OST to Office 365 account. Users are strongly advised to use the automated professional PassFixer OST to Office 365 Converter Tool. Because it eliminates all risks and limitations. Also, it comes with a free demo edition facility for all users to export initial 25 items from each OST folder free of cost.

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