Your flagged emails in Outlook are not appearing as tasks in Microsoft To Do. This breaks your workflow for managing tasks across both applications. The sync connection relies on your Microsoft account and specific cloud services. This article provides steps to re-establish the link and get your flagged items syncing again.
Key Takeaways: Reconnecting Outlook and Microsoft To Do
- File > Account Settings > Account Settings > Repair: Refreshes the connection to your Microsoft 365 or Outlook.com account, which can resolve sync authentication errors.
- Windows Settings > Apps > Apps & features > Microsoft To Do > Advanced options > Reset: Clears local app data that may be causing a corrupted sync state on your device.
- Outlook Flag for Follow Up vs. Microsoft To Do Flagged Email list: The sync only works for emails flagged in Outlook, not for tasks created directly in To Do that need to appear in Outlook.
How the Outlook and Microsoft To Do Sync Works
The integration between Outlook and Microsoft To Do is powered by the Microsoft Graph. When you flag an email in Outlook, it creates a task item in a hidden folder within your Exchange or Outlook.com mailbox. Microsoft To Do reads from this specific folder to display your flagged emails in its “Flagged Email” list.
For this to work, you must be signed into both applications with the same Microsoft account. The account must have an active internet connection and permissions to sync tasks. The sync is one-way for flagged emails: from Outlook to To Do. Tasks you create directly in Microsoft To Do do not sync back to your Outlook Tasks folder by default.
Prerequisites for a Working Connection
First, verify your setup meets the requirements. You need Outlook for Windows connected to a Microsoft 365, Outlook.com, or Exchange Online account. The classic Outlook desktop app is required; the sync feature is not fully supported in Outlook on the web or the Mail app for Windows. Ensure you have the latest updates installed for both Outlook and Microsoft To Do from the Microsoft Store.
Steps to Reconnect and Restore Sync
Follow these methods in order to diagnose and fix the broken sync connection between Outlook and Microsoft To Do.
Method 1: Verify Account and Basic Settings
- Check your account in both apps
Open Outlook and go to File > Account Settings. Confirm your primary email address is a Microsoft work or personal account. Then, open Microsoft To Do, click your profile picture, and ensure the same account is listed and active. - Confirm the sync setting in Outlook
In Outlook, go to File > Options > Tasks. Under the “Microsoft To Do” section, verify the box for “Sync flagged items to Microsoft To Do” is checked. Click OK to save any changes. - Force a manual sync
Flag a new email in Outlook for follow-up. Wait for two minutes, then open Microsoft To Do and manually pull down on the “Flagged Email” list to refresh it. Check if the new item appears.
Method 2: Repair Your Account Connection
- Initiate account repair in Outlook
Close Microsoft To Do. In Outlook, navigate to File > Account Settings > Account Settings. Select your email account and click the “Repair” button above the list. - Follow the repair wizard
A new window will open. You may need to re-enter your account password. Follow the on-screen prompts to complete the repair process. Restart Outlook when finished. - Reset the Microsoft To Do app
Open Windows Settings, then go to Apps > Apps & features. Find “Microsoft To Do” in the list, click the three-dot menu, and select “Advanced options.” Click the “Reset” button, then confirm. This clears the app’s local data without uninstalling it.
If Sync Problems Persist After Reconnection
Outlook flag does not create a task in To Do
This often points to a corrupted local Outlook data file. Close all apps and run the Microsoft Support and Recovery Assistant. This tool can automatically detect and fix sync issues with Outlook and Microsoft services. You can also try creating a new Outlook profile via Control Panel > Mail > Show Profiles > Add.
Microsoft To Do shows duplicate or old flagged items
The sync may be stuck on outdated data. In Microsoft To Do, try archiving all items in the “Flagged Email” list. Right-click the list name, select “Archive list.” Then, in Outlook, unflag and re-flag a few emails. The new items should sync, and old duplicates should not return.
Tasks created in To Do do not appear in Outlook
Remember, the default sync is one-way for flagged emails. To see To Do tasks in Outlook, you must enable a separate setting. In Microsoft To Do, go to Settings > Connected Apps. Ensure the connection to Outlook is listed and active. Some organizational IT policies may disable this bidirectional sync.
Outlook Task Sync Methods Comparison
| Item | Flagged Email Sync | Full Tasks Sync |
|---|---|---|
| Direction | One-way: Outlook to To Do | Two-way between apps |
| Data Source | Emails flagged for follow-up | Tasks folder in Outlook / Any list in To Do |
| Setup Required | Checkbox in Outlook Options | Connection in To Do Settings > Connected Apps |
| Common Issue | Broken after account password change | Disabled by organization admin policy |
You can now restore the sync between your flagged Outlook emails and Microsoft To Do. Start by repairing your account connection in Outlook and resetting the To Do app. For advanced control, explore the Connected Apps settings in Microsoft To Do to manage two-way task synchronization. Use the Windows Task Scheduler to create a rule that automatically flags emails from specific senders, populating your To Do list without manual effort.