Migrating from Google Workspace to Microsoft 365

We move a whole domain from Google Workspace to Microsoft 365 without collecting users' passwords: the administrator grants access once, and Loomigrate copies the data in the background. Before you decide you can check the first 200 items from 3 mailboxes for free.

Before you start

• In Microsoft 365 add your domain (during the migration you can use the *.onmicrosoft.com domain) and create users with licenses.
• On the Google side you need a super administrator account. Loomigrate uses domain-wide delegation (a service account), so you do not need users' passwords. The instructions are in the help inside the panel.
• On the Microsoft side you grant organization-wide access through a registered application (Entra ID), also without passwords.
• List what you are moving: mail, calendars, contacts, Google Drive (to OneDrive) and shared drives. You pick each of these modules separately in the wizard.
• A day earlier lower the TTL of your MX records to 300 seconds.

Step by step in Loomigrate

1. Create an account on loomigrate.com and open the "New migration" wizard. Choose "Google Workspace (whole domain)" as the source and "Microsoft 365 (whole organization)" as the destination.
2. Provide the Google service account and the Microsoft application details. The wizard tells you where to find them in the admin consoles.
3. Fetch the list of users from the domain and match source mailboxes to destination ones. Identical addresses are matched automatically, renamed ones you fix by hand.
4. Click "Test connections", then run the "Free test" on a few mailboxes (up to 200 items from each).
5. Mail is one project. Calendars, contacts and files you add as separate projects in the same wizard, by choosing the module at the start.
6. Start the full migration. Progress is live, and interrupted tasks can be resumed.

What to watch out for

• Gmail labels appear over IMAP as folders. A message with several labels can end up in several folders, so counts on the two sides may differ. The verification report shows whether anything is missing on the destination.
• Google Meet, Chat and Google Groups (mailing lists) are not part of the mail migration. Recreate groups in Microsoft 365 by hand.
• Permissions on Google shared drives and documents have no 1:1 equivalent in SharePoint and OneDrive. Check them after the files migration.
• After granting permissions in the Google console, changes can take a few minutes to become visible. If the connection test fails right away, wait a moment and try again.

The mail switch and final steps

1. Run a last sync right before the change.
2. In DNS replace the Google MX records (aspmx.l.google.com and the others) with the single record from the Microsoft 365 admin center.
3. In SPF replace include:_spf.google.com with include:spf.protection.outlook.com, and add Microsoft's DKIM records and autodiscover.
4. Update users' Outlook, phones and meeting invitations.
5. For 30 days after completion you can re-run the sync free of charge. Cancel the Google subscription only after you have checked that nothing is missing.

What it costs

A mailbox (mail, calendar and contacts together) costs €10 net, a personal drive €3, a shared drive €19, a Teams team €28. A volume discount applies from 50 accounts in a project.

Frequently asked questions