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Written By Harshita Sachdeva
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Approved By
Shivam Rathore -
Updated on July 31st, 2026
Migrate from Google Workspace to Microsoft 365 for IT Admins
Summary: Almost every enterprise is planning to migrate from Google Workspace to Microsoft 365 to take advantage of M365-provided access to Outlook, Teams, SharePoint, OneDrive, robust security, and compliance capabilities. Of course, without a proper migration strategy, you risk all forms of problems, including data loss, service disruption, and login and authentication issues.
In this 2026 migration article, we cover Google Workspace to M365 migration, including a pre-migration plan, different methods, post-migration tasks, common challenges and how to avoid them, and tips for a smoother transfer. This blog also introduces how to export emails, calendars, contacts, etc., using the Aryson Google Workspace Migration to overcome all the data transfer complexities with complete security.
What is Google Workspace to Office 365 migration?
A Google Workspace migration is the process of moving a company’s email, calendars, contacts, files, and collaboration tools from Google Workspace to Microsoft 365. Companies most often migrate when a particular organisation chooses to standardize its services on Microsoft’s solutions due to integration with their Windows operations or business functionalities, or if there is a merger or acquisition involving that organization.
Google Workspace to Microsoft 365 Service Mapping
| Google Workspace Service | Microsoft 365 Service | Purpose |
| Gmail | Outlook | Email communication and mailbox management |
| Google Drive | OneDrive | Personal cloud file storage and sharing |
| Shared Drives | SharePoint | Team document management and collaboration |
| Google Calendar | Outlook Calendar | Scheduling meetings and managing calendars |
| Google Contacts | Outlook Contacts | Contact storage and synchronization |
Why Do Businesses Move from Google Workspace to Office 365?
Google Workspace is a competent and affordable set of cloud-based tools for corporate use. Still, many eventually transition to Microsoft 365 as their requirements for operational, collaboration, and security services evolve. With its ease of integration with Windows-based computing platforms and an added level of security, Microsoft 365 has become the ideal fit for companies large and small. Here’s a look at some of the top reasons why they migrate from Google Workspace to Microsoft 365:
- Most businesses use Outlook as their email client. It offers an efficient integration with other Microsoft applications, advanced email management, and offline access. So, to improve communication and daily workflow, organizations move to M365.
- Security is the top concern of every organization these days. Microsoft’s advanced security protocols such as multi-factor authentication and Microsoft Defender satisfy the security needs of businesses.
- Document versioning, access permissions, and collaborative functionality in SharePoint make it particularly useful for midsize to large organizations.
- Industries meet regulatory requirements through Microsoft 365 compliance features such as retention policies and eDiscovery.
- OneDrive for Business provides secure cloud storage with automated file synchronization across devices. Employees can access files from anywhere and collaborate in real time.
Pre-Migration Planning For A Successful Migration
If you want to perform a secure and successful transfer of emails from Google Workspace to Microsoft 365, carefully prepare your source and destination environment before the migration. This will ensure that there is no data loss or business downtime and that authentication issues do not occur after the migration.
- Assess your existing Google Workspace environment, including user mailboxes, contacts, calendars, tasks, notes, and duplicate emails. Clean up unnecessary data before migration to reduce processing time and storage.
- Define the scope at the start of the migration to select the suitable migration method and estimate the time required to complete it.
- Prepare your Microsoft 365 environment before any data is transferred. This includes verifying your domain, creating user accounts, assigning the required M365 licenses, and ensuring that Outlook is ready to receive mailbox data.
- Ensure both source and destination environments have admin accounts with the required permissions. You may also need to configure OAuth authentication or enable particular Google APIs to authorize secure data access.
- Perform the migration during periods of low network activity to ensure uninterrupted transfer.
- Before transferring all users, conduct a pilot migration with a few user accounts to verify user mapping, folder hierarchy, and email delivery and to identify potential issues. This helps to identify and correct mistakes for a smooth migration.
- Maintain a backup of business-critical data in case of an unexpected situation. This gives you an extra level of security for your messages.
Challenges During Google Workspace Migration to Office 365
| Challenge | Description | Solution |
| Large Mailbox | Mailboxes containing years of emails and large attachments can increase the processing time | Migrate users in batches and schedule large mailbox migrations during off-peak hours. |
| Data Loss | Interrupted migration or incorrect configurations can result in missing emails, attachments, contacts, or calendars | Create a complete backup before migration and validate migrated data upon completion. |
| Authentication Errors | Incorrect admin permissions or authentication settings can prevent mailbox access during migration. | Verify permissions for Google Workspace Super Admin and Microsoft 365 Global Administrator, and configure OAuth correctly. |
| Slow Internet Connection | Limited bandwidth can slow down the migration, especially for organisations with large amounts of data. | Ensure a stable internet connection and avoid running bandwidth-intensive tasks during migration. |
| Folder Mapping Issues | Gmail labels and Outlook folders work differently, which may affect the mailbox organisation after migration. | Verify folder mapping during testing and review migrated folders before completing the project. |
Different Methods to Migrate from Google Workspace to Microsoft 365
There are multiple ways to transfer your Google Workspace users to Microsoft 365, and the right approach depends on factors such as the number of users, mailbox sizes, data types, available budget, and technical expertise. While small organizations may successfully use Microsoft’s built-in migration tools, businesses with hundreds of users or large volumes of data often prefer professional migration software for a faster and smoother experience.
| Migration Method | Email Migration | Contacts Migration | Skip Previously Migrated Items | Split Resultant PST files | Calendar Migration | Technical Expertise Required | Desktop Application (No SaaS Dependency) |
| Aryson | ✔ | ✔ | ✔ | ✔ | ✔ | Low | ✔ |
| Microsoft Migration Tools | ✔ | ✔ | 🗙 | 🗙 | ✔ | High | 🗙 |
| BitTitan MigrationWiz | ✔ | ✔ | ✔ | 🗙 | ✔ | Moderate | 🗙 |
| Cloudiway | ✔ | ✔ | ✔ | 🗙 | ✔ | Moderate | 🗙 |
| ShareGate | ✔ | ✔ | ✔ | 🗙 | ✔ | Moderate | ✔ |
Manual Method to Migrate from Google Workspace to Microsoft 365
Microsoft 365 has a built-in feature for transferring emails from Google Workspace to M365. Organisations with a few emails can use this to migrate emails for free. The manual method requires some preliminary steps to begin transferring email, such as adding your domain in Office 365 and creating user accounts to act as target mailboxes for migration. Make sure that new M365 accounts have proper licenses. After that, we can start the transfer of emails to Office 365.
- Open Exchange Admin Center & navigate to Migration >> Add migration batch.
- Create a migration batch and select Migration to Exchange Online >> Google Workspace migration.
- Choose the automated setup and sign in with your Google Workspace Super Admin account.
- Validate the Google APIs and download the automatically generated JSON key file.
- Authorise the Client ID and OAuth scopes in the Google Workspace Admin Console.
- Create a new migration endpoint and enter the Gmail administrator email address.
- Add the users to migrate manually or by uploading a CSV file.
- Select the target domain and mailbox data to migrate, then review the configuration.
- Enable automatic batch start and completion, set the time zone, and click Save to start the migration.
Drawbacks of Manual Methods
- Longer processing time while transferring large mailboxes containing years of emails and attachments.
- Higher possibility of losing folder hierarchy, which can become a problem later while finding files in the destination environment.
- There are no options for advanced filters such as date range, skip previously migrated, or custom folder naming.
- You should have technical knowledge of Microsoft 365 to perform the following steps to migrate data easily.
- Without proper planning, businesses may experience downtime.
Professional Method for Google Workspace migration to Office 365
Organizations that handle thousands of user email accounts can use an automated way to migrate their data. Thus, Aryson provides them with a secure and reliable Google Workspace Migration tool. This software delivers accurate and quick results while transferring Google Workspace data from different services to Microsoft 365 in bulk. Moreover, there is no need to be concerned about data loss. You can also back up Google Workspace to PDF, PST, CSV, and MBOX. Below, we will outline the steps for using a professional migration method.
Step-by-Step Guide to Migrate from Google Workspace to Microsoft 365 Using An Automated Method
Step 1: Download and install the Aryson Google Workspace migration tool on your device.
Step 2: Select Mailbox Migration from Choose Migration Mode.
Step 3: There are a total of three ways to connect your account to the software: i) OAuth/Modern Auth, ii) IMAP+ App Password, and iii) Workspace Admin (DWD)
- Connect your account using OAuth. Enter your Gmail address, client ID, client secret, and click Continue with Google.
- Use IMAP + App Password to connect your account. Enter your Gmail address and app password, and click Connect with IMAP.
- Connect your Workspace Admin (DWD) account. Enter your admin account, JSON, or P12 key file, and click Continue Workspace.
Step 4: Tick the Gmail account you want to migrate, then click Continue.
Step 5: Select the mailbox folder you want to migrate and click Continue.
Step 6: Pick Microsoft 365 and login via Modern OAuth2.0 or Impersonation method.
Step 7: Apply the advanced filters to your Gmail account and click Start Migration.
Step 8: Check the migration logs to confirm that all emails have been transferred.
Need a more detailed walkthrough?In order to know the complete step-by-step workflow of the Google Workspace to Office 365 migration, you may refer to the Detailed Documentation of the Aryson Google Workspace to Office 365 migration tool. This comprehensive guide would help you avoid any kind of migration issues or data loss.
🎥 Watch the Complete Migration Video
Benefits of Using the Aryson Google Workspace Migration Tool
- Migration of large mailboxes is completed with less processing time.
- Moreover, there are different authentication methods available to allow users login (credentials are safe and never saved on the software).
- Provides migration logs to verify that all emails have been transferred successfully or if there are any failed or skipped migrations.
- Advanced filtering options are available, such as custom folder naming, skipping previously migrated items, splitting resultant files, and others.
- Folder hierarchy is maintained throughout the migration.
Conclusion
Migration methods always depend on the type of user account and the organization’s requirements. If there are a few accounts to migrate, you can use either a manual or a professional method. Both will give accurate results. But if there is an organization with a large number of user accounts, the manual way will not be a wise choice. You should use professional steps to migrate from Google Workspace to Microsoft 365, which will also give you multiple features like bulk migration, filtering options, preserving folder hierarchy, and migration logs for verification.
Frequently Asked Questions
Q1. How do I migrate from Google Workspace to Microsoft 365?
Ans: Use dedicated migration software such as the Aryson Google Workspace Migration tool to transfer emails to Microsoft 365, as it offers features to enhance the process, like duplicate email removal, date-range filtering, and attachment handling.
Q2. What data can I move from Google Workspace to Office 365?
Ans: Email, contacts, calendars, tasks, notes, attachments, and Google Drive are transferred from Google Workspace to M365.
Q3. How long does a Google Workspace to Office 365 migration take?
Ans: It depends on the number of user mailboxes, total volume of data, internet bandwidth, and the migration method used. Choose the Aryson Google Workspace migration tool, as it takes very little time to complete.
Q4. Will I lose my emails during Google Workspace migration to Office 365?
Ans: If you are using the manual method, there is a chance of losing emails during the migration. Whereas, while using the professional software, the risk of data loss is significantly decreases. Thus, the end user would not lose their important data.
Q5. What authentication methods can I use to migrate Google Workspace mailboxes?
Ans: You can connect using OAuth 2.0 (Modern Authentication), IMAP with an app password, or Workspace Admin authentication via Domain-Wide Delegation using a JSON or P12 key file. For bulk migrations, the Domain-Wide Delegation method is usually the better choice since it lets an administrator authorize access across the entire domain without needing each user to log in individually.
Q6. Which APIs handle the data transfer on the Google side and the Microsoft side?
Ans: On the Google side, the migration relies on the Gmail API, Drive API, Calendar API, and People API, all authenticated through OAuth 2.0. On the Microsoft side, everything routes through the Microsoft Graph API, which provides unified access to Outlook, OneDrive, and Exchange Online.
Q7. What Microsoft Graph permissions does the admin account need to grant?
Ans: For mailbox migrations, the minimum required permissions are Mail.ReadWrite, Contacts.ReadWrite, Calendars.ReadWrite, and User.ReadWrite.All. If you’re also migrating Drive content to OneDrive or SharePoint, you’ll additionally need Sites.FullControl.All, Files.ReadWrite.All, User.Read.All, Directory.Read.All, and Group.Read.All.
Q8. What happens if the migration hits a Google API rate limit or quota error partway through?
Ans: The software automatically retries the request after a short delay and logs the event, so the migration can continue without requiring a manual restart in most cases.
Q9. What mailbox mapping options are available for large-scale migrations?
Ans: Four mapping types are supported: one-to-one, one-to-many, many-to-one, and many-to-many. For migrations involving hundreds of users, uploading a CSV file to map accounts in bulk is much faster than pairing each mailbox manually.
Q10. How are Shared Drives handled differently from My Drive during a OneDrive migration?
Ans: Content from My Drive migrates directly into the destination’s My Drive. Content from Shared Drives, “Shared with Me,” and Trash gets placed into separate subfolders within that same My Drive, with the original folder hierarchy kept intact inside each one.
About The Author:
Harshita Sachdeva, a professional technical writer at Aryson Technologies, specialize in delivering clear, hands-on documentation for data management, migration, and recovery solutions. With a meticulous, reader-first approach, I break down complex technical processes into simple, actionable content - helping IT professionals and decision-makers tackle challenges efficiently.
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