two-way calendar sync
Two-Way Calendar Sync vs One-Way Sync: Which Should You Use?
Compare two-way calendar sync and one-way calendar sync for Google, Outlook, and Microsoft 365 calendars.
One-way sync is usually safer
One-way sync copies events from a giver calendar into a taker calendar. It is easier to reason about, easier to keep private, and less likely to create loops.
When two-way sync makes sense
Two-way sync helps when both calendars are equally important scheduling surfaces. For example, you may need Outlook to see Google events and Google to see Outlook events.
Real-time expectations
Real-time calendar sync should mean changes are reflected quickly enough to prevent scheduling conflicts. The important part is reliable update tracking, not just fast polling.