GALSync
Global Address List Synchronization
Synchronize your Global Address List across Microsoft 365, Exchange On-premises, and Google Workspace. Essential for mergers, acquisitions, and multi-tenant organizations.
Microsoft 365 
Exchange On-premises 
Google Workspace What is GALSync?
GALSync (Global Address List Synchronization) is a cloud-based coexistence solution that automatically synchronizes address books between Microsoft 365 tenants, Exchange On-premises servers, and Google Workspace. It creates contacts or mail users on target systems, enabling users to find and communicate with colleagues across different email platforms.
During mergers, acquisitions, or tenant consolidations, users need to discover and contact people in other organizations. GALSync ensures all Global Address Lists stay current by synchronizing user details, distribution groups, and contact information across all connected systems without manual intervention.
When to Use GALSync
Address book synchronization for enterprise collaboration scenarios
Mergers & Acquisitions
Enable seamless collaboration between companies during M&A transitions. Users can find and contact colleagues across both organizations instantly.
Multi-Tenant Organizations
Organizations with multiple Microsoft 365 or Google Workspace tenants can maintain unified address books across all environments.
Hybrid Environments
Bridge on-premises Exchange servers with cloud tenants. Keep address books synchronized across hybrid deployments.
Migration Coexistence
During mailbox migrations, maintain address book synchronization so users can communicate regardless of migration status.
GALSync Features
Everything you need for seamless address book synchronization
Automatic Synchronization
Automatically sync contacts in all Global Address Lists (GAL) so that all mail systems remain up to date without any manual intervention.
Users & Groups Sync
Synchronize users, distribution groups, and mail-enabled security groups as contacts or mail users on target systems.
Bi-directional Sync
Configure one-way or bi-directional synchronization between any number of tenants and on-premises environments.
Scheduled Intervals
Set your preferred synchronization interval. GALSync runs automatically at scheduled times to keep address books current.
Deletion Propagation
When enabled, deleted users or groups from source tenant are automatically removed from target tenant on next sync.
Secure & Compliant
Uses OAuth 2.0 and Graph API for secure authentication. SOC 2 Type II certified and GDPR compliant.
100% SaaS
Nothing to install. Configure GALSync online from your web browser and let Cloudiway handle the rest.
Free/Busy Integration
Combine GALSync with Calendar Free/Busy for a complete enterprise coexistence solution.
What GALSync Synchronizes
Users and groups from source systems are created as contacts on target systems
Objects
Created As
How GALSync Works
Simple setup, automatic synchronization
Connect Your Tenants
Connect your Microsoft 365, Exchange, or Google Workspace environments using secure OAuth authentication.
Configure Sync Settings
Choose which objects to synchronize (users, groups), map attributes, and set your preferred sync interval.
Run Initial Sync
Execute the first synchronization to populate address books across all connected systems.
Automatic Updates
GALSync runs automatically at scheduled intervals, keeping all address books synchronized.
Cost Effective
Save time and costs with automated and scheduled synchronization processes. No manual address book updates needed.
100% Cloud
No installation required. Configure everything online from your web browser. Cloudiway handles all processing.
Expert Support
Our support team can assist during your project. Extensive knowledge base and documentation available.
GALSync FAQ
Common questions about GALSync
What is GALSync?
GALSync (Global Address List Synchronization) is a cloud-based solution that synchronizes address books between Microsoft 365 tenants, Exchange On-premises servers, and Google Workspace. It creates contacts or mail users on target systems so users can find and communicate with colleagues across different email platforms.
Which platforms does GALSync support?
GALSync works with any combination of Microsoft 365 tenants, Exchange On-premises (2007 or later), and Google Workspace for Business. You can synchronize between multiple Microsoft tenants, between Microsoft and Google, or any hybrid combination.
Do I need to install any software?
No. GALSync is a 100% SaaS solution. Simply configure it through your web browser, connect your tenants using OAuth authentication, and set your synchronization preferences. Cloudiway handles all the processing in the cloud.
How often does GALSync synchronize?
You can configure synchronization intervals based on your needs - from hourly to daily. GALSync runs automatically at scheduled times to keep all address books current without manual intervention.
Can I use GALSync during a migration?
Yes. GALSync is ideal for maintaining address book synchronization during mailbox migrations. Users can continue to find and email colleagues regardless of whether they have been migrated yet. Once migration is complete, you can discontinue GALSync.
What happens when a user is deleted?
With the "Propagate deletion" option enabled, when a user or group is deleted from the source tenant, the corresponding contact will be automatically removed from the target tenant during the next synchronization cycle.
Can I combine GALSync with Calendar Free/Busy?
Yes. GALSync is part of the Cloudiway enterprise coexistence suite. You can combine it with Calendar Free/Busy lookup to provide a complete collaboration experience across tenants, allowing users to see each other's availability when scheduling meetings.
How long does it take to set up GALSync?
Setup is typically completed within a day. You connect your tenants using OAuth, configure synchronization settings, map attributes, and run the initial sync. Our support team can assist with configuration if needed.
GALSync Resources
Explore documentation, guides, and related solutions
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