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Compare GCRS & GCCHN

Your users can continue to use HCL Notes alongside Google Calendar with Google Calendar Connector for HCL Notes (GCCHN) and Google Calendar Resource Sync (GCRS), whether together or separately.

GCCHN lets your users view each other’s availability regardless of whether they’re using Notes or Calendar. This can help during a Google Workspace deployment, for example, if pilot users have Calendar and other users have Notes. GCRS is used to synchronize HCL Notes calendar resources and Calendar resources. During a Google Workspace migration, for example, pilot users on one system can view resources booked in the other.

Distinguish between GCRS & GCCHN

What it does Share users’ free or busy information between Calendar and Notes. Synchronize Notes Resource Reservations database with Google Calendar Resources.
How it does it

From Calendar—Real-time lookup from Google Calendar is the interface to Notes (web service).

From Notes—Calendar data gets pulled into Notes busytime store hourly (scheduled Domino agent).

Runs every 5 minutes (scheduled Domino agent).
When to use it You have some users using Google Workspace and others using Notes, typically during your migration and deployment period. Your users are moving from Notes to Google Workspace, and you want to let users book resources in either system during the deployment.

Use these products with GWMHN

To improve calendar coexistence during your Google Workspace, you can use GCCHN and GCRS with Google Workspace Migration for HCL Notes (GWMHN). You use GWMHN to migrate mail, calendar, contacts, and group information from your Notes' account to Google Workspace.


  • You should only use GWMHN with GCCHN for users who have fully migrated to Calendar. This is because Calendar data replaces your users’ Notes calendar data.
  • You can use GWMHN with GCRS without the risk of conflicts.

Related topics

Google, Google Workspace, and related marks and logos are trademarks of Google LLC. All other company and product names are trademarks of the companies with which they are associated.

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