i have many duplicate appointments in calandar

Question

i have many duplicate appointments in calandar how do i delete the duplicates in calendar

Answer 1

Hi Barry Milner,

For Outlook.com / Outlook on the web, duplicate appointments most commonly come from one of a few scenarios:

• More than one calendar is being displayed at the same time
• The same events were imported or synced more than once
• A recurring appointment (or part of a series) was duplicated

Outlook.com can show multiple calendars simultaneously, and that recurring appointments can be deleted as This event, This and all following events, or All events in the series.

First, check which calendars are being displayed. In the left calendar list, uncheck every calendar except your main one. If the “duplicates” disappear, they were coming from another calendar being shown, not from true duplicates inside the same calendar.

If the duplicates are within the same calendar, the most practical cleanup approach is to work with a list of matching items instead of opening each appointment individually. Outlook.com doesn’t have a traditional list view, but Calendar search displays results in a list format. Search for the duplicated subject or a specific date range, then remove the extra copies directly from the results list. Microsoft confirms that calendar search in Outlook.com / Outlook on the web returns results as a list.

Use extra caution with recurring appointments. Do not delete the entire series unless you’re certain the whole duplicate series is unwanted.

• If only one or a few occurrences are duplicated, choose This event.
• If duplicates begin from a specific point onward, This and all following events may be safer.
• Reserve All events in the series for cases where the entire duplicate series is clearly the bad copy.

These delete options are supported in Outlook.com and help prevent accidental data loss.

To help prevent this in the future, avoid importing the same calendar file more than once, and double‑check whether an additional synced calendar is being displayed. If the duplicate items actually belong to another calendar, hiding or removing that calendar is usually safer than deleting appointments individually.

For reference:

• Create, modify, or delete a meeting request or appointment in Outlook.com
• Working with multiple calendars in Outlook.com
• Search your calendar in Outlook.com

If duplicates still appear after checking visible calendars, sharing how the events were originally added or synced can help determine the next best step.

Please let me know if this proves useful to you, or if you would like further assistance.

I'm looking forward to your reply.

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment”.   

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

To clean up duplicate appointments in the Outlook calendar, switch the calendar to a list view so duplicates are easy to spot and remove in bulk.

1. Open Calendar in Outlook.
2. In the Navigation Pane, select the Calendar folder that has the duplicate items.
3. Go to the View tab, then in the Current View group select Change View and choose List.
4. Click the Subject column header to sort items by subject so duplicate appointments are grouped together.
5. Hold down CTRL and click each duplicate entry to select all the extra copies.
6. Press DELETE to remove the selected duplicates.

To help prevent duplicates when importing calendar data in the future, in the Import and Export Wizard choose either Do not import duplicates or Replace duplicates with items imported instead of Allow duplicates to be created.

---

References:

• Delete duplicate calendar items
• Outlook shows conflict errors when updating or cancelling meetings