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Written By
Simran Bhatia -
Approved By
Sonika Rawat -
Updated on
July 8th, 2026 -
Read Time
7 minutes
We have 350 Office 365 users, each with 2–5 PST files (20–80 GB) to import into Online Archive. Outlook becomes almost unusable during manual imports, and we’re also trying to eliminate PSTs because of OneDrive sync issues. What’s the best way to import PST to Online Archive Office 365?
~ James Wilson, UK
The importation of PST files into Office 365 Online Archive assists organizations in handling storage limitations effectively and complying with data requirements. Most individuals will try to move Outlook archive to Online Archive through either Outlook or the Office 365 Import Service; however, these techniques may require some level of technicality and time considerations. The SysInfo Office 365 Backup Tool is an effective way to move PST files to the Online Archive without losing any information.
Before moving to the advanced utility method, we will cover some manual solutions for the “End Users” and the “IT admins” below.
There are multiple ways to import PST to Online Archive Office 365. In this section, we will cover the import/export Wizard, the copy folder method, and the drag and drop of content from PST. The method we will cover in this section works better for small migrations. Also, it is time-consuming while handling the large PST files.
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Ⓘ This method is best suited for small PST files and one-time imports. |
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Ⓘ Your Outlook can be unresponsive during the implementation because of the content and the size of the folder. |
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Ⓘ This is time-consuming and impractical for large PST files. |
Note: All the methods above are DIY approaches for small or moderate migrations. To move PST file to Online Archives in bulk, there are two options: Network Upload and SysInfo Office 365 Backup Tool. Let’s move towards the execution of both approaches.
This method allows “IT admins” to handle the bulk migration securely using AzCopy and the Microsoft Purview portal.
Steps to Export Outlook PST to Online Archive
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Limitation: This method is for IT admins and requires technical configuration, including AzCopy and CSV mapping. |
The SysInfo Office 365 Backup Software provides an easy solution to import PST files to Office 365 Online Archive mailboxes. The tool enables importing the PST content without the installation of the Microsoft Outlook application on the system. The tool is capable of importing PST content in Primary, Shared, and In-Place Archive mailboxes. Folder structure and integrity will be maintained during the entire migration process.
Steps to Move Outlook Archive to Online Archive







For backing up Office 365 mailbox data, it is necessary to choose a reliable technique to protect emails, contacts, and calendar items from unexpected deletion or loss. In case of manual backup, there may be some problems associated with the large size of mailboxes or dealing with several users. The SysInfo Office 365 Email Backup Tool comes as a perfect solution that saves the hierarchy of folders, allows batch processing, and permits migration to another software platform directly. Companies willing to ensure easy mailbox backup and management can use this convenient tool to import PST to Online Archive Office 365 without errors.
Ans: You can use the Microsoft Purview Network Upload method or the SysInfo Office 365 Email Backup Tool. For large-scale migrations, the SysInfo tool provides a simpler way to import multiple PST files while preserving the folder hierarchy and data integrity.
Ans: Yes. If you know the password, you can unlock the PST file before importing it. The SysInfo Office 365 Backup Software also supports importing password-protected PST files by prompting for the password during the process.
Ans: Outlook-based manual methods may become slow with large PST files. However, the SysInfo Office 365 Email Backup Software supports importing large PST files without file size limitations, making it suitable for enterprise migrations.
Ans: Yes. Both the Microsoft Purview Network Upload method and the SysInfo Office 365 Migrator allow you to import PST files directly into an Online Archive mailbox instead of the primary mailbox.
Ans: Yes. As long as the PST files are accessible, you can migrate them to Office 365 Online Archive. The SysInfo Office 365 Migration Tool lets you browse and import PST files from local locations.
Ans: Yes. During the migration process, you can map PST data to the required Online Archive mailbox. The SysInfo Office 365 Migration Software also provides user mapping and maintains the original folder structure throughout the import process.
About The Author:
Simran Bhatia is a technical content writer engaged in writing clear, concise, and SEO-optimized content. With a background in computer science and a passion for writing, I thrive to deliver complex technical content in simple layman terms.
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