Microsoft Outlook users might be familiar with the two file formats being used i.e. OST and PST. In order to import OST file to Office 365, it should be converted into the PST file format because, OST file cannot be accessed anywhere directly. After converting OST to PST, user will be able to access the data on either Microsoft Outlook or Office 365.

Easy Solution: You can use OST file recovery tool to import OST file to Office 365 with ease.


“ I was trying to import my Outlook OST files to Office 365 directly. But, there was no such method and solutions avaiable for the same. Is there any free or automated solution through which I can move OST file to Office 365 cloud quickly”.

Steps to Import OST File to Office 365 Outlook

Considering, the above scenario there is no such direct method available which can migrate OST file to Office 365 Outlook. To do so, user must follow the two steps:

  1. Convert OST file into PST format
  2. Import the converted PST file to Office 365.

So, first let us see how to import OST file into PST.

1. Export OST File to PST

Here are some of the steps to import the data file from OST to PST:

Archiving: Outlook users can use this method to copy or move the data to a PST file. It is the best suitable method when the user wants to move everything from the mailbox. Here, the following steps for this step:

  1. First, open Microsoft Outlook application.
  2. Second, go to File tab and click on Archive.
  3. Third, user should select the destination to save the archived PST file.
  4. Fourth, the process of Archiving will start after clicking on the OK button.

Note: Using this step users can move entire OST file data except the Outlook Contacts.

Exporting:Exporting is a quick and easy solution to move all the contents of an OST file to a new PST file or only just Contacts and Calendars. The steps for this method is as follows:

  1. First, open Microsoft Outlook.
  2. Second, click on the File tab the, select the file using Export to a File and finally click on the Next button.
  3. Third, select the .pst(Personal File Folder) and click on Next button.
  4. Fourth, select the folder where user wants to export and then check for Include subfolders.
  5. Finally, user must the select the location where they can store the exported files and click on Finish button.

Note: To use this feature the user must be connected to Exchange Server.

Shift Items to a New PST File:Now, in this method users have to create a new PST file in their profile and shift all the folders to the new PST file created. The steps to implement this are as follows:

  1. First, open Microsoft Outlook application.
  2. Second, create a new PST file in the Outlook profile.
  3. Finally, select the mailbox folder where the user wants to shift the items to a PST file.

Note: This solution does not allow users to shift Inbox, Sent Items, Calemdars and Contacts.

Limitations of the Manual Procedures

The limitations of the manual methods to convert OST to PST mentioned above are as follows:

  • Data can be lost easily.
  • Internet connection is a must.
  • Archiving does not allow to export the Contacts in a folder.
  • Exchange server connectivity is a must everytime when performing these steps.

Automated Solution to Import OST file into PST

Because, the manual methods are not reliable in so many cases. The use of the automated OST to PST converter is the best solution to export OST file to PST.

2. Importing PST to Office 365 Outlook

There are no such direct steps for migrating OST file to Office 365 Outlook. First, the user must convert OST file into PST format using either the manual steps or using the automated solution. After completing this the user should use PST to Office 365 Migration tool to move Outlook data file(.pst) to Office 365 Cloud.

Here are the steps to export PST to Office 365 Outlook using Office 365 PST migration tool :

  • First, open the Office 365 Migrator Tool.
  • Second, the user should click on the Office 365 Restore option.
  • Third, click on Browse button and select the PST file.
  • Fourth, apply the mail filter options to import PST files to Office 365 Outlook.


There are manual methods for the users as they are free. But, these methods are not easy to use as it definitely requires a good technical knowledge and one wrong implementation of any method can lead to the loss of data. Another drawback of these methods is that it is very time consuming and lengthy process.



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