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Email Sync Problems

Fix Missing Outlook Tasks in Microsoft To Do Web App

Maira MehtabMaira Mehtab Sep 20, 2026 868 views

Question details

Tasks visible in the Outlook mobile app fail to appear in the Microsoft To Do web application due to a synchronization failure.

Product
Microsoft Outlook and Microsoft To Do
Device & OS
not provided
Scenario
Syncing tasks between the Outlook mobile app and To-Do.live.com.
Observed behavior
Some or all tasks created or visible in Outlook mobile do not populate on the Microsoft To Do web app.
Before you start

Verify that your mobile device and computer both have an active, stable internet connection, as offline devices cannot synchronize tasks to Microsoft's cloud servers.

Solution 1Recommended

Verify and Match Microsoft Accounts

Mismatched accounts are the most common cause of missing tasks. Ensure both platforms are using the exact same Microsoft login.

Microsoft To Do relies on your Microsoft Exchange account to sync tasks. If your Outlook mobile app is logged into a different default account than your web browser, the tasks will remain segregated.

1
Check Outlook Mobile Account

Open the Outlook app on your mobile device, tap your profile icon in the top left, and note the primary email address listed under settings.

2
Check To Do Web Account

Navigate to To-Do.live.com in your desktop web browser. Click your profile picture in the top right corner to view the currently logged-in Microsoft account.

3
Synchronize Accounts

If the email addresses do not match, sign out of the web application and sign back in using the exact Microsoft account tied to your Outlook mobile app.

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Frequently Asked Questions

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

Flagged emails will only appear in Microsoft To Do if you have explicitly enabled the 'Flagged email' list. You can turn this on by going to To Do Settings > Smart lists, and toggling 'Flagged email' to on. Also, ensure both applications are using the same Microsoft account.

Does Microsoft To Do sync automatically across all my devices?

Yes, Microsoft To Do is designed to sync automatically across all devices connected to the internet. However, server latency, mismatched accounts, or caching issues can sometimes delay or interrupt this automatic synchronization.

How long does it take for Outlook mobile tasks to appear on the To Do web app?

Under normal conditions, synchronization is nearly instantaneous. If you experience delays, refreshing the web page or completely closing and reopening the mobile app usually forces a manual sync within a few seconds.