How to Export PST Files to Office 365?
Written By: Sristi Rana 
Updated On October 20, 2026 Written By: Sristi Rana Updated On October 20, 2026 For the last two decades, we have been working with Outlook as our primary source of email communication. But due to advancements in technology and components offered, we have switched to Office 365. However, during export PST to Office 365, we experienced a process failure due to an unknown error. Is there any method or tool that can help us perform this email export without losing even a single email?
Businesses export their PSTs into the Office 365 environment to migrate legacy archive emails or restore data from local backup within the PST files. This practice is often blocked by errors like permission denied, PST file is too large, or corrupted Outlook data files. To escape the risk of losing data and export emails safely, you need methods that are easy yet effective. Learn how to export PST files in Microsoft Outlook 365 using manual and professional methods.
Microsoft Purview Portal provides access to the Import service, which you can use to perform bulk PST to Office 365 export. Two native ways provided to export PST file include:
With the network upload method to transfer PST to Office 365, you first upload the data from the PST to a temporary storage (Azure Blob storage). Later, you can use the Microsoft Import Service to export the PST data to the mailboxes within your Office 365 organization.
The next method to export PST file in Outlook 365 is drive shipping. First, copy all the PST files to an encrypted (BitLocker encryption) hard drive and then ship the physical drive to Microsoft. Once the Microsoft data center receives the drive, they will upload the entire data to a temporary location in the Azure storage within the cloud. Later, the import service is used to upload the data.
Using manual methods (Network Upload method and Drive Shipping method) may cause disasters because of their complex process and incomplete procedures. However, to avoid all the risks and limitations of manual methods, use the professional’s recommended tool to export PST files in Microsoft Outlook 365.
Kernel Import PST to Office 365 is an ultimate solution for exporting Outlook PST file items to Office 365. It is very efficient for exporting healthy Outlook data files (OST/PST) to Office 365 mailboxes without any data loss. Unlock benefits like incremental transfers, selective migration, and mailbox mapping. Along with migrating multiple PST files to Office 365 group, Mailboxes, or Archive Mailboxes this tool exports PST files to a hosted Exchange or Microsoft Exchange server with advanced data filtration feature.
Follow the steps below to export Outlook PST files to Office 365 at ease:
Step 1: Launch the Import PST to Office 365 tool. Click on +Add to add the source PST files and destination Office 365 mailboxes (manually or using a CSV file).
Step 2: Select Office 365 mailboxes to map them against the PST files.
Step 3: Select the required filtering criteria (Folders, Date, & Item Type), exclusion options (Deleted folder/empty folders), and other options (Hierarchy migration/Archive mailbox migration).
Step 4: After successfully exporting PST files to Office 365, you can save the report to a CSV file.
Manual export PST to Office 365 can have severe consequences on the data integrity. It is highly recommended to use the above-mentioned professional software to export Outlook PST file in Outlook 365 mailboxes. With its user-friendly interface, the tool helps both technical as well as ordinary users to securely export PST file data to Office 365.
A: Here is why you need to export PST files to Office 365:
A: To create import jobs and import PST files into Microsoft 365, you need one of the following role assignments: