Email Sync Problems

Fix Flagged Outlook Emails Not Syncing to Microsoft To Do

Algirdas Jasaitis Sep 25, 2026 868 views

Question details

The user is unable to view older flagged Outlook emails within Microsoft To Do, despite newly flagged emails syncing without issues.

How to Fix Flagged Outlook Emails Not Appearing in Microsoft To Do

Product: Microsoft Outlook and Microsoft To Do
Device & OS: not provided
Scenario: Syncing older flagged emails from Outlook to Microsoft To Do tasks on web or desktop clients.
Observed behavior: Newly flagged messages sync correctly, but older flagged emails are missing from the Microsoft To Do task list.

Before you start

Ensure that you are logged into both Microsoft Outlook and Microsoft To Do with the exact same Microsoft account, and check your internet connection to rule out basic connectivity problems.

Solution 1Recommended

Verify Flag Status and Force Manual Sync

Check if the older emails are still actively flagged in Outlook and force an update to the sync servers.

Sometimes older emails lose their flag status or the sync connection temporarily drops. Re-flagging the items can push a manual update to Microsoft To Do.

Check Outlook flags

Open Microsoft Outlook and navigate to your older emails to verify they still have an active red flag icon next to them.

Toggle the flag

Click the flag icon to unflag one of the older emails, wait a few seconds, and then click it again to flag it. This action forces an update to the sync servers.

Verify To Do integration

Open Microsoft To Do settings (gear icon) and ensure the 'Flagged email' connection under Smart Lists is toggled to the On position.

Verify Flag Status and Force Manual Sync

Sync Delay: It may take a few minutes for the manually toggled flags to reflect in your Microsoft To Do web or desktop application.

Solution 2

Seek Specialized Microsoft To Do Support

If only older emails are failing to sync while new ones work, the issue may require backend troubleshooting from Microsoft.

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Frequently Asked Questions

Why are my flagged emails not showing up in Microsoft To Do?

This usually happens if the 'Flagged email' smart list is disabled in To Do settings, if you are using different Microsoft accounts for Outlook and To Do, or due to a temporary server synchronization delay on Microsoft's end.

How do I turn on the Flagged email list in Microsoft To Do?

Open Microsoft To Do, click on Settings (the gear icon at the top right), scroll down to the 'Connected apps' or 'Smart lists' section, and toggle the switch for 'Flagged email' to On.

Can I sync flagged emails from a non-Microsoft email provider?

No, the flagged email integration in Microsoft To Do only works with Microsoft-hosted accounts, such as Outlook.com, Hotmail, Live, or Microsoft 365 work and school accounts.

How long does it take for a flagged Outlook email to appear in To Do?

Typically, the email syncs almost instantly. However, during network congestion or backend server maintenance, it might take a few minutes to appear in your Flagged email list.

Outlook & Email Problems