G Suite to Office 365 Migration – Step-by-Step [2025 Guide]

Office 365 & G Suite – Introduction

Today, email migration from G Suite to Office 365 is becoming essential due to the enhanced features offered by Microsoft 365. It’s known for being scalable, reliable, and secure, and includes tools like OneDrive, Word, Excel, PowerPoint, Skype, and Outlook. It also offers large mailboxes, built-in security, flexible working, and more.

Meanwhile, G Suite (Google Workspace) has limitations, particularly for standard licenses and when adding users. These restrictions often prompt users and businesses to consider switching to the more comprehensive Office 365 environment.

Why Migrate from Google Mail to Office 365?

• More cost-effective pricing plans.
• Office 365 is tailored for business management.
• Access to a wide range of applications including Outlook, SharePoint, Teams, OneDrive for Business, Calendar, and more.
• Robust data security and integrity features.
• Encrypted communication and trusted file storage.

Manual Approach: G Suite to Office 365 Migration Step-by-Step

Process 1: Create a Google Mail Service Account

1. Open your browser and go to the Google Developer page for Service Accounts.
2. Sign in with your Google Workspace account.
3. Create a new project and name it.
4. Click “Create” under the service account setup.
5. Continue without setting permissions and click “Create Key.”
6. Select JSON as the key type and download the file.
7. Enable “G Suite Domain-wide Delegation” and note the unique service account email.

Process 2: Enable API Usage

1. Go to the Google API library and sign in.
2. Select the project created earlier.
3. Enable the following APIs: Gmail API, Google Calendar API, and Contacts API.

Process 3: Grant Access to the Service Account

1. Go to the G Suite Admin Panel.
2. Navigate to Security > Advanced Settings > Manage API Client Access.
3. Enter the client ID and add the following scopes:
   • https://mail.google.com/
   • https://www.googleapis.com/auth/calendar
   • https://www.google.com/m8/feeds/
   • https://www.googleapis.com/auth/gmail.settings.sharing
4. Click “Authorize.”

Process 4: Add and Verify Domains

1. Go to Domains > Add/remove domains in G Suite.
2. Select “Add a domain” or “Add a domain alias,” enter the domain name, and verify ownership.

Process 5: Verify User Accounts in Office 365

Ensure all users from G Suite are created and synced in Office 365 before beginning migration.

Process 6: Start Migration via Exchange Admin Center (EAC)

1. Open the Exchange Admin Center (EAC) and go to Recipients > Migration.
2. Click the “+” icon and select Migrate to Exchange Online.
3. Choose G Suite (Gmail) migration and click Next.
4. Upload the CSV file with user email addresses.
5. Upload the JSON key file and proceed.
6. Enter a migration batch name and assign a target domain.
7. Select the report recipient and begin the migration.

You can track the status of your migration in the same Migration window of the EAC.

Use G Suite to Office 365 Migration Tool: Professional Approach

DRS Softech G Suite Backup Tool is a powerful utility designed to simplify G Suite to Office 365 migration. It supports the transfer of multiple user mailboxes, including emails, contacts, calendars, and Google Drive files. It also supports migration to other platforms like Yahoo, Outlook, IMAP, and Gmail.

Steps to Migrate G Suite to Office 365 Using the Tool:

1. Download and install the DRS Softech G Suite to Office 365 Migration Tool.
2. Log in with your G Suite credentials and upload the .p12 file.
3. Select the user mailboxes to migrate and click Next.
4. Select Gmail as the source and Office 365 as the destination.
5. Enter your Office 365 credentials to log in.
6. Select desired filters and options (e.g., skip duplicates, maintain folder hierarchy).
7. Click the Backup button and assign an output folder name.
8. Wait for the process to complete and close the application.

Related Post: Migrate Google Workspace Email to Gmail.

Conclusion

Whether you choose the manual method or a professional solution, you can successfully migrate data from Google Workspace (G Suite) to Microsoft 365 (Office 365). For users looking to avoid technical complexity and potential errors, the automated G Suite to Office 365 Migration Tool is highly recommended for safe and reliable transfer.