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How to Sync Google Workspace with Microsoft 365

Learn how to sync Google Workspace with Microsoft 365 for calendar, contacts, and email integration. Set up coexistence scenarios and migrate data between platforms.

7 min readUpdated January 2026

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Many organizations use both Google Workspace and Microsoft 365, whether during migrations or for hybrid environments. This guide covers practical methods to sync calendars, email, contacts, and files between the two platforms.

Sync Google Calendar with Outlook

Method 1: Subscribe to Google Calendar (Read-Only)

  1. Open Google Calendar
  2. Click the three dots next to your calendar
  3. Select Settings and sharing
  4. Scroll to Integrate calendar
  5. Copy the Secret address in iCal format
  6. In Outlook desktop: File > Account Settings > Internet Calendars
  7. Click New and paste the iCal URL
  8. Name the calendar and click OK

Note: This creates one-way sync. Events added in Google appear in Outlook (read-only).

Method 2: Two-Way Sync (Third-Party Tools)

For bidirectional calendar sync, consider:

  • Sync2 - Desktop app for Outlook-Google sync
  • CalendarBridge - Cloud-based calendar sync service
  • Zapier/Power Automate - Create automation for event copying

Add Gmail to Outlook

Outlook Desktop (Windows/Mac)

  1. Open Outlook
  2. Go to File > Add Account
  3. Enter your Gmail address
  4. Click Connect
  5. Sign in to Google when prompted
  6. Grant Outlook access permissions
  7. Gmail syncs to Outlook automatically

Outlook Web

  1. Go to outlook.com
  2. Click Settings (gear) > View all Outlook settings
  3. Go to Mail > Sync email
  4. Click Gmail
  5. Follow prompts to connect your account

Sync Contacts

Export from Google, Import to Microsoft

  1. Go to contacts.google.com
  2. Click Export in the left sidebar
  3. Select Outlook CSV format
  4. Click Export and save the file
  5. In Outlook: File > Open & Export > Import/Export
  6. Choose Import from another program or file
  7. Select Comma Separated Values
  8. Browse to your CSV file and complete import

For Ongoing Sync

Use third-party services:

  • ContactSync - Dedicated contact sync tool
  • PieSync (HubSpot) - Two-way contact sync
  • Zapier - Automate contact creation between platforms

Share Files Between Google Drive and OneDrive

Manual Transfer

  1. Download files from Google Drive
  2. Upload to OneDrive
  3. Tip: Use Google Takeout for bulk export

Third-Party Sync Tools

ToolFeaturesBest For
MultCloudSync, transfer, backupOne-time migrations
CloudHQReal-time syncOngoing synchronization
RcloneCommand-line syncTechnical users, automation
Air ExplorerDesktop app, multi-cloudManaging multiple clouds

Run Both Desktop Apps

Install both Google Drive for Desktop and OneDrive. They can sync different folders simultaneously without conflict.

Migrate from Google Workspace to Microsoft 365

For full migration, use Microsoft's built-in tools:

Microsoft 365 Admin Center Migration

  1. Sign in to admin.microsoft.com
  2. Go to Setup > Data migration
  3. Select Gmail as source
  4. Create migration batches
  5. Map users from Google to Microsoft 365
  6. Start migration
  7. Monitor progress in admin center

What Migrates

  • Email (all folders, labels become folders)
  • Calendar events
  • Contacts

What Requires Separate Migration

  • Google Drive files (use separate tool or manual)
  • Google Sites
  • Google Forms
  • Google Sheets/Docs (convert to Office format)

Coexistence Scenarios

Email Coexistence

When both platforms need to receive email for the same domain:

  • Use email routing rules
  • Configure MX records for primary platform
  • Set up forwarding for users on secondary platform
  • Consider dual-delivery during transition

Calendar Coexistence

For teams split between platforms:

  • Use free/busy sharing between systems
  • Subscribe to shared calendars across platforms
  • Consider Calendar Interop tools for enterprises

Using Power Automate for Integration

Create automated workflows between platforms:

Example: Sync Calendar Events

  1. Go to flow.microsoft.com
  2. Create new Automated flow
  3. Trigger: "When a new event is created" (Google Calendar)
  4. Action: "Create event" (Outlook)
  5. Map fields (title, date, time, location)
  6. Save and enable flow

Common Automations

  • Copy new Google Calendar events to Outlook
  • Sync Google Contacts to Microsoft 365
  • Save Gmail attachments to OneDrive
  • Create Outlook tasks from Google Tasks

Best Practices

  • Plan before migrating: Inventory what needs to move
  • Test with pilot users: Validate sync before full rollout
  • Document DNS changes: Track MX, SPF, DKIM records
  • Train users: Provide guidance on new workflows
  • Monitor sync status: Check for errors regularly

Frequently Asked Questions

Find answers to common questions

Yes, Google Workspace and Microsoft 365 can coexist and share data. You can sync calendars between Google Calendar and Outlook, access Gmail in Outlook, share contacts, and collaborate on files. This is common during migrations or in organizations using both platforms.

In Outlook, go to File > Account Settings > Internet Calendars and add your Google Calendar's iCal URL (found in Google Calendar settings > Integrate calendar). For two-way sync, use third-party tools like Sync2 or calendar sync services like CalDAV sync.

Yes, add your Gmail account in Outlook using IMAP settings or the newer Google OAuth connection. Go to File > Add Account, enter your Gmail address, and follow the authentication prompts. Outlook will sync your Gmail inbox, folders, and contacts.

Use the Microsoft 365 Admin Center migration wizard or third-party tools like BitTitan MigrationWiz. The process involves connecting both platforms, mapping users, and migrating email, calendar, and contacts. Plan for DNS changes when cutting over email delivery.

There's no native sync between Google Drive and OneDrive. Options include manual download/upload, third-party sync tools like MultCloud or CloudHQ, or migration tools for one-time transfers. Both desktop apps can run simultaneously syncing different folders.

Not automatically. You can export Google Contacts as CSV and import to Outlook/Microsoft 365, or use third-party sync services for ongoing synchronization. Some organizations use directory sync tools for enterprise contact management.

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