Duplicate events appear when two or more calendar services try to represent the same meeting. Common culprits include syncing a phone with a desktop client, importing .ics files from different organizers, or copying an invitation without deleting the original. Each platform—Google Calendar, Outlook, Apple Calendar—has its own sync logic, which can unintentionally create overlapping entries.
The consequences go beyond a messy visual layout. Users may show up late, double‑book resources, or miss important deadlines because they trust the wrong entry. Over time, the noise can erode confidence in the calendar as a planning tool, leading to extra manual checks that defeat the purpose of digital scheduling.