Best way to migrate hundreds of IMAP mailboxes to Google Workspace?

General Discussions
1

What’s the most practical approach when an organization has hundreds or even 1,000+ IMAP mailboxes to move into Google Workspace?

Google’s current IMAP migration process supports user mapping and CSV-based imports, with up to 100 IMAP users per import. That’s workable for smaller projects, but I’d rather avoid repeatedly handling accounts manually for a large deployment.

I came across the DRS Softech IMAP to Google Workspace Migration Tool, which is designed around bulk migration. It supports Single Account as well as Batch/CSV mode, and source accounts can be mapped to destination Workspace users. The mapping options include one-to-one, one-to-many and many-to-one, with a View Mapping option for checking assignments before starting.

It also uses multithreading for faster processing and has Active Tasks for monitoring ongoing jobs, plus All Reports for reviewing completed migrations and errors.

For MSPs or internal IT teams that regularly migrate multiple clients, would you prefer this kind of dedicated migration utility over running several smaller Google migration jobs? I’m particularly interested in experiences with large batches and account mapping accuracy.

2

Migrating hundreds of IMAP mailboxes to Google Workspace can become difficult when each account is handled manually. A trusted IMAP to IMAP Migration Software can simplify the process. I would consider Softaken IMAP to IMAP Migration Tool for this type of migration because it supports Gmail, G Suite, Office 365, iCloud, and other IMAP servers.

  • Add the source IMAP account and enter the required credentials.

  • Add the destination Google Workspace account.

  • Preview mailbox folders before migration.

  • Use the date-based filter when only specific emails are required.

  • Migrate Inbox, Sent, Drafts, custom folders, and attachments.

  • Preserve the mailbox folder structure during migration.

  • Generate a migration log to review the transfer.

For hundreds of accounts, test a small batch first, verify permissions and folder mapping, then proceed with the larger migration.

3

For large-scale IMAP-to-Google Workspace projects, I have also used the Shoviv IMAP to Google Workspace Migration Tool and found it reliable for bulk moves. It supports bulk migration, so admins can move hundreds or thousands of mailboxes together instead of handling them one by one. It is designed to make large-scale IMAP migrations simpler, faster, and easier to manage for IT teams and service providers.