Calendar Problems

How to Stop Outlook from Sending Repeated Meeting Acceptances

Natalie TaylorNatalie Taylor Oct 10, 2026 870 views

Question details

The user needs to resolve an issue where Microsoft Outlook continuously sends duplicate meeting acceptance emails to event organizers.

How to Stop Outlook from Sending Repeated Meeting Acceptances
Product
Microsoft Outlook
Device & OS
not provided
Scenario
Accepting meeting invitations and synchronizing the calendar across multiple devices.
Observed behavior
Outlook sends dozens or hundreds of duplicate meeting acceptance messages to the organizer due to a continuous synchronization loop.
Before you start

Identify all devices connected to your email account, such as smartphones, tablets, or Macs, as a synchronization loop between these devices is usually the root cause of this issue.

Solution 1Recommended

Restart Calendar Synchronization on Connected Devices

Turning off and then turning back on the calendar sync on connected devices (like an iPhone or Mac) can break the communication loop that generates the duplicate messages.

This issue is frequently caused by a connected mobile device or Mac failing to properly sync with the Exchange server, causing it to retry the acceptance repeatedly.

1
Access Device Settings

Open the Settings app on the iPhone or System Settings on the Mac that is connected to the affected email account.

2
Locate Account Sync Settings

Navigate to the Mail or Accounts section and tap on the specific email account used for the meeting.

3
Disable Calendar Sync

Toggle the switch next to 'Calendars' to the off position to stop synchronization.

4
Re-enable Synchronization

Wait for about a minute, then toggle the 'Calendars' switch back on to establish a fresh connection to the server.

Restart Calendar Synchronization on Connected Devices
Synchronization Refreshed: Resetting the connection usually clears the queued responses and stops the duplicate emails immediately.
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Frequently Asked Questions

Why is Outlook sending hundreds of meeting acceptances?

This usually happens due to a synchronization loop between the Exchange email server and a connected mobile device (such as an iPhone or Mac). The device fails to register that the acceptance was successfully sent, prompting it to retry the action repeatedly.

Can an outdated Outlook app cause duplicate meeting responses?

Yes, running an outdated version of the Outlook desktop app or mobile app can lead to synchronization bugs. Updating your software to the latest version via the App Store or Microsoft Office update tool often resolves underlying sync glitches.

Does clearing the Outlook cache stop duplicate emails?

Clearing the cache can sometimes help if the duplicate sending is caused by corrupted local data. However, for continuous meeting acceptance loops, turning calendar sync off and on for your connected devices is usually the most effective fix.