Home » MS Outlook » OST » [Solved] Best Method to Import OST to Office 365?

Migrating email data from one platform to another, such as- Outlook OST files to Office 365 can sometimes becomes a challenging task. In this blog post, we’ll explore the best method to import OST to Office 365 with an easy process.

In today’s digital age, businesses and individuals rely heavily on email communication for their daily operations. Outlook and Office365 are the services that enable users to manage emailing tasks with ease and safety. 

But nowadays, Office 365 ( also known as Microsoft 365) has become a popular choice for email services due to its robust features and cloud-based accessibility. That’s why many users want to move from Outlook to Office 365 service and for switching from Outlook users requires to Import OST to Office 365.

Understanding OST Files and Office 365:

Before we delve into the migration process, let’s clarify what OST files and Office 365 are:

OST (Offline Storage Table) Files: OST files are offline copies of mailbox data stored by Microsoft Outlook when you’re working in an Exchange environment. They allow you to access your email even when you’re not connected to the server. 

Office 365: Microsoft Office 365 is a subscription-based suite of cloud-based productivity tools that includes email services through Exchange Online. It offers features like real-time collaboration, ample storage, and seamless integration with other Microsoft applications.

For transferring Outlook profile data to Office365 account, OST files become a primary medium for users.

Challenges in Importing OST to Office 365:

Importing OST files to Office 365 can be tricky due to the following challenges:

  • Data Format Differences: OST files are specific to Outlook and have a different format than the PST (Personal Storage Table) files commonly used for data migration.
  • Security Concerns: OST files may contain sensitive or confidential information, making secure migration essential.
  • Complex Process: Manual migration involves several steps, including OST to PST conversion and then PST to Office 365 migration.

The Best Method to Import OST to Office 365:

To overcome the challenges mentioned above, it is recommended to use professional third-party tools specially designed for OST to Office 365 migration. Enstella OST to PST Converter is one such efficient tool that will help you in completing this migration. Using this tool you can ensure a secure and efficient migration

Steps to Import OST to Office 365 using Enstella OST to PST Converter:

  • Download and Install the Software: Download and install the OST to PST Converter on your Windows-based system.
  • Launch the tool and add OST: Open the software Press the select OST button and add OST files into the software.
  • Preview Data: Scan selected OST files and get a preview of all OST file’s inner content. You can review and select needed data that you want to migrate from OST.
  • Upload PST to Office 365: Click on Import to Cloud >> Import to Office365 button. Input the Office 365 account login details and select other necessary settings and upload all data from the PST file to Office 365 account. 

Advantages of using Enstella OST to PST Converter:

  • OST to PST and 13+ other formats:- Enstella OST Converter software is able to convert OST files to PST, EML, MSG, ELMX, MBOX, HTML, Zimbra, VCF, ICS, Gmail, Office365, Yahoomail, Outlook.com.
  • Batch conversion:- it has the ability to perform batch conversion that allows users to convert multiple OST files to Office 365 at once.
  • Selective Conversion:- The tool often offers the option to select specific mailbox items or folders for conversion, giving you the flexibility to choose exactly what data you want to export.
  • Efficiency: The software ensures a smooth and accurate conversion process while maintaining data integrity.
  • User-Friendly Interface: The intuitive interface makes the migration process hassle-free, even for non-technical users.
  • Compatibility: The software is designed to work with various versions of Microsoft Outlook and Windows operating systems.
  • Technical support: It provides 24/7 customer support via email and chat to solve any issues or queries the user may have while using the software.


Importing OST to Office 365 is a very challenging task for every user. So over this blog, we have mentioned the best practices as well as a great third-party tool that will help you to overcome the challenges faced by the users. I think after reading this blog you will get help to import OST files to your Office 365 account.