If you’re trying to upload PST files to Office 365 without relying on Outlook, the reality is this: there’s no true “direct upload” button inside Microsoft 365. You either follow Microsoft’s backend methods or use a specialized tool to simplify the process.
The native approach is the Network Upload method, where you upload PST files to Azure storage using AzCopy, then map them via a CSV file and import them into mailboxes. While effective, it’s technical, time-consuming, and requires admin roles and careful configuration. For large or multiple PST files, this method becomes even more complex and error-prone.
That’s why many users skip Outlook entirely and use automated solutions like the
MacSonik PST to Office 365 Migration Tool. It allows you to directly upload PST files to Office 365 accounts without Outlook, Azure setup, or PowerShell. You simply load PST files, log in with admin credentials, map users, and start migration. This approach reduces manual effort, avoids technical dependencies, and supports bulk migration with filters for selective data transfer.
In short, while Microsoft offers indirect manual methods, using a dedicated tool is the fastest and most practical way to upload PST files to Office 365 without Outlook—especially for businesses handling large-scale migrations.
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