If you want to back up your Office 365 (Microsoft 365) mailbox to a PST file but don’t have Outlook installed, there are two effective ways to do it: using the Microsoft Purview eDiscovery tool or a third-party backup solution.
Use Microsoft Purview (eDiscovery Export Tool)
This is a free, admin-level tool available in the Microsoft 365 Compliance Center. To use it, log in to https://compliance.microsoft.com, navigate to Content Search, and create a new search specifying the mailboxes you want to export. Once the search completes, click Export results and choose the option to download mailbox content as a PST file.
This method doesn’t require Outlook but does require admin permissions and a browser like Microsoft Edge to run the eDiscovery Export Tool. It’s ideal for backing up specific users or entire mailboxes securely and officially.
Use Third-Party Backup Tools
If you don’t have admin access or want a user-friendly interface, several third-party tools can back up Office 365 mailboxes directly to PST. Popular options include MailsDaddy Office 365 Backup, Office 365 Exporter, and Veeam Backup for Microsoft 365. These tools support exporting emails, contacts, calendars, and attachments without needing Outlook.
In conclusion, while Outlook is a common way to export PST files, it’s not the only option. With Microsoft Purview or reliable third-party tools, you can back up your Office 365 mailbox securely and efficiently — no Outlook required.
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