What’s the Best Way to Migrate from a Multi-Tenant to Your Own?

You might want to check out tools like Edbmails, Cloudiway, or CloudFuze; they may be able to migrate your email and OneDrive/SharePoint at a lower cost than BitTitan.

Using a bunch of custom PowerShell scripts can help with migrating AD users and seamlessly changing profiles on desktops. But just a heads up, it might be quite time-consuming, especially with over 3TB in OneDrive data and all the email stuff too.

I think the $50 one-time fee per user isn't too bad when you consider what’s involved. If cost is a concern, Powershell commands can get the job done for free. Additionally, Orchestrator is great for managing M&A style migrations between multiple tenants, but it requires knowledge of USMT and might involve more hands-on desktop work.

Have you thought about using eDiscovery/Purview for mailbox searches? You can export to PST and then upload it to users in the new tenant. We did this using PowerShell, and it works for OneDrive too. Just a tip: running it from a dedicated device or server can save a lot of time.

Veeam’s been my go-to for mailbox and OneDrive backups, and then I just reupload everything to the new tenant. It’s a quick solution but note that it doesn’t manage deltas or handle end-user clients or SharePoint.