03 Easy Methods to Import OST to Office 365

Summary: Many users have this question “How to open OST file in Outlook 365?”If you are such a user, then you are in the right place. In this blog, we will discuss the manual as well as professional OST to PST Converter Tool to import OST file to Outlook 365.

OST (Offline Storage Table) files are supported by Microsoft Exchange to save the mailbox database in offline mode. The user can even work on the offline OST and the changes then made will get updated once the internet connectivity is re-established. You cannot directly access OST files in MS Office 365. Therefore, users search for ways to perform the migration process to access the OST files data in Office 365 easily. Before we move on to the solutions, let’s look at some of the benefits of using an Office 365 account.

Reasons to Import OST Files to Outlook 365

The cloud-based Office 365 application offers several advantages for users. Some of the common advantages are mentioned below.

  • Office 365 provides better security of data.
  • The user can easily access email messages from anywhere using internet connectivity.
  • Users need to purchase a plan suitable according to their requirements.
  • Services such as MS Outlook, Skype, and SharePoint, are integral parts of Office 365.

After exploring the reasons, let’s discuss the two solutions using which users can Import OST to Office 365.

How to Import OST Files in Outlook 365?

There are many methods available on the internet to import OST to Office 365. However, those methods can be difficult to perform. After a lot of research, we will talk about the best two methods that can make the conversion process easier for the users. Let’s start with the manual approach.

Manual Methods to Import OST Emails to Office 365

The manual method consists of two steps.
1. Convert the OST files to PST format.
2. Upload the PST files to the Office 365 account.

Step 1: Convert OST to PST Format

  • Open the MS Outlook program on your device.
  • Go to the File menu>> Import and Export.
  • Select the Export to a File option. Choose PST as a saving file.
  • Now, choose the desired OST files to import and tick the include subfolder option.
  • After that, click on the Browse option to save PST files.
  • Finally, hit on the OK button to save the file.

Step 2: Upload PST Files to Office 365

  • Launch the Office 365 application on your device.
  • Click on Admin Centre>> Exchange Admin Center>>Permission.
  • Now, tap on Organization management>>+sign>> Mailbox import export >>ADD.
  • After that, Select the mailbox to import and tap on Save.
  • Again go to the Admin center>> Setup>>Data Migration.
  • Click on the Upload file.
  • Now select New Import Job and enter the job name.
  • Select Show Network Upload SAS URL.
  • Copy and paste the URL on Notepad.
  • Install and Run Azure AzCopy and type:

AzCopy.exe./Source:\Network Path or File Location /Dest: “SAS URL”/V: location path where you want to save log file/AzCopy.log/Y.

  • Create a CSV file to map the uploaded PST file into a mailbox account.
  • Check both options in the Import Data Window.
  • Click on the Select Mapping File>>Upload CSV File>>Validate>> Save.
  • The PST file will be uploaded to Office 365.

Limitations of the Manual Method

  • This method is a lengthy and time-consuming process.
  • Users require technical knowledge to perform this conversion.
  • Data hierarchy can be compromised.

To overcome these drawbacks of the manual approaches, many experts prefer using the professional OST to PST Converter Tool.

Professional Solution to Import OST Files to Outlook 365

Using the professional OST to PST Converter is considered the best method to import OST to Office 365. This method provides a quick and secure bulk migration of OST files to an Office 365 account without any data alteration. This thor-party software allows users to convert OST to PST, EML, MBOX, CSV, PDF, HTML, Gmail, Office 365, Yahoo, Thunderbird, etc. This tool provides 100% accurate results while keeping the folder hierarchy intact.


In this blog, we have discussed the best methods available to import OST to Office 365 account. The manual approach is critical to perform. Therefore, many users recommend using the professional solution as it provides secure migration and prevents any data loss.

About The Author:

Related Post

© Copyrights 2018-2024 Migrate Emails - All Rights Reserved