Share Calendars Across Platforms Safely (Google, Outlook, Apple)

Share Calendars Across Platforms Safely (Google, Outlook, Apple)
Why full calendar sharing is risky
Sharing a calendar with full details can leak meeting topics, attendee lists, and private notes. Across Google, Outlook, and Apple, the default share options are often too generous.
Safe defaults
- Free/Busy only: share availability without meeting details. Basics: Free/Busy Only.
- Invite controls: require approval for new guests.
- Disable public links unless paired with expirations.
Cross-platform tips
- Google → Outlook: share via ICS, not “Public URL.”
- Outlook → Apple: send as “View only” subscription.
- Apple → Google: use iCloud’s read-only link with hidden address option.
Onboarding checklist
- Verify the recipient identity before sharing. Habit: Verify Links.
- Choose the smallest scope (single calendar, not “All events”).
- Set expiry for temporary shares (common in project work).
Offboarding & incidents
- Revoke ICS feeds when contracts end.
- Rotate shared links yearly or sooner.
- Audit shares quarterly. Sweep: Audit Messages.
Useful external references
Related reading
Share Meeting Links & Recordings Safely · Share Calendly Links Safely · Hand Off HubSpot Access
Bottom line
Share availability, not details. Use scoped invites and expiring links to keep calendar sharing under control.
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