Enterprise Outlook to Google Workspace Migration Looking for Real-World Recommendations

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Our IT team is preparing an enterprise migration from Outlook to Google Workspace, and one of the biggest tasks is moving years of archived PST files. The environment contains hundreds of employee mailboxes, shared project folders, and historical email archives that must remain accessible after migration. Since several departments depend on old conversations for compliance and customer support, preserving mailbox integrity is just as important as completing the migration quickly.
We're currently evaluating different ways to import PST to Google Workspace while minimizing downtime and reducing manual effort. One challenge is that employees continue working during the migration period, so we're considering a phased rollout with pilot users before moving production departments. Another concern is validating that every folder, attachment, and email reaches the destination successfully. Reporting and mailbox verification are mandatory because management wants documented proof that the migration completed successfully without data loss.

During my research, I came across the DRS Softech PST to Google Workspace Migration Tool, which appears to support batch processing, advanced filters, preview functionality, and secure Google Workspace authentication. Those capabilities seem appropriate for larger environments, but I'd really like to hear from administrators who have completed similar enterprise migrations. Did automated reporting actually reduce validation time? Were there any unexpected authentication or performance issues during production deployment?
For anyone who has recently needed to migrate PST files to Google Workspace, what would you recommend as the most important preparation step before migration begins? Did you compare mailbox statistics afterward, perform user acceptance testing, or rely on migration reports? Any practical advice that could help reduce post-migration support requests would be extremely valuable.
 

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