The Recoveryfix Import PST to Office 365 tool is a specialized desktop utility designed for direct, automated migration of local Outlook PST and OST files into cloud-based Office 365 accounts. It is highly regarded as one of the best ways to complete this migration because it completely bypasses the complex, multi-step manual processes.

Bulk Import Capabilities: Enables administrators to map and migrate multiple PST files to multiple user accounts simultaneously using an automated CSV file.
Data Integrity Preservation: Retains the exact original folder hierarchy, email metadata, attachments, and read/unread statuses.Incremental Migration: Tracks previously uploaded files to skip already migrated data, preventing any item duplication.
Flexible Target Selection: Allows users to route data directly into primary mailboxes, archive folders, public folders, or specific Office 365 Groups.