Guides
Step-by-step instructions for connecting Google and Microsoft calendars, keeping event details out of calendars that should not see them, and fixing sync when it breaks.
For IT admins
Approve Caltsu for your organization, and see exactly which permissions it asks for.
How to allow Caltsu in Google Workspace
Steps for Google Workspace admins to allow Caltsu in the Admin console, with the exact OAuth scopes it requests and what each is for.
4 min read
How to approve Caltsu in Microsoft Entra
Steps for Microsoft 365 admins to review and approve Caltsu in Microsoft Entra, with the exact delegated permissions it requests and why.
4 min read
Sync your calendars
Connect Google and Microsoft calendars so each one shows when you are busy.
How to sync Google Calendar with Outlook (two-way or one-way)
Google Calendar and Outlook have no built-in two-way sync. Set up a two-way Busy sync with Caltsu, or subscribe to Google Calendar in Outlook for free. Steps for both.
5 min read
How to sync two Google calendars (or merge them into one view)
Share one Google calendar with your other account for free, or set up a two-way sync so each account shows you as busy. Steps for both, checked against Google's help pages.
6 min read
How to sync two Outlook calendars, or several Microsoft 365 tenants
Outlook can show two calendars side by side, share free/busy or publish an ICS link, but none of these blocks time in the other account. Free steps from Microsoft's help pages, and a two-way sync for consultants with several tenants.
7 min read
How to sync Google Calendar with other calendars
How to sync Google Calendar with Outlook and other calendar apps, using Caltsu, a manual ICS export or built-in subscriptions.
3 min read
Keep event details private
Show that you are busy without showing what the event is.
How to make Google Calendar events private
Keep personal appointments private while still showing availability to colleagues, using Google's private events or Busy blocks.
3 min read
Fix sync errors
What to check when events stop appearing or show up twice.
Fix Google Calendar sync errors
Troubleshoot common Google Calendar sync issues: missing events, duplicates, Outlook sync problems, delays and permission errors.
4 min read
Something missing? Write to support@caltsu.com and we will add a guide.