Email Sync Problems

How to Link Third-Party Webmail to Microsoft To Do

Aamir Naveed Akram Oct 21, 2026 868 views

Question details

The user wants to know if they can flag emails from a third-party mailbox (such as 123 Reg) in Outlook and have those flagged items automatically synchronize with Microsoft To Do.

How to Link Third-Party Webmail to Microsoft To Do

Product: Microsoft To Do
Device & OS: not provided
Scenario: Managing tasks and flagged emails from a non-Microsoft webmail account.
Observed behavior: Microsoft To Do does not natively support direct flagged-email synchronization with arbitrary third-party mailboxes, and sync capabilities depend heavily on the Outlook account type.

Before you start

Ensure your third-party email account is fully set up in your Outlook desktop application and verify whether you are using IMAP or POP, as this affects your ability to sync data with Microsoft servers.

Solution 1Recommended

Flag Emails Directly in the Outlook Desktop App

Use Outlook's native flagging feature for third-party accounts, keeping in mind that To Do synchronization is limited for non-Exchange accounts.

Microsoft To Do primarily synchronizes flagged emails from Exchange or Outlook.com accounts. For third-party webmail like 123 Reg configured via IMAP, you can still flag emails locally in Outlook, though they will not automatically appear in the To Do app's 'Flagged email' list.

Open Outlook

Launch the Microsoft Outlook desktop client where your third-party email is configured.

Select the email

Locate and click on the email from your third-party inbox that you want to track.

Flag the message

Right-click the email, hover over 'Follow Up', and select 'Flag to Message', or simply click the flag icon displayed next to the email in your inbox list.

Flag Emails Directly in the Outlook Desktop App

Sync Limitation: Because the account is a third-party webmail, these flagged items will remain as local tasks within Outlook and will not push to Microsoft To Do.

Solution 2

Manually Create Tasks from Emails

Drag and drop emails to the task view in Outlook to manually create synced tasks.

Solution 3

Use Microsoft Power Automate for Task Creation

Create a custom workflow to generate To Do tasks when specific emails arrive in your third-party inbox.

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Frequently Asked Questions

Can I sync IMAP email flags to Microsoft To Do?

No, Microsoft To Do generally only syncs flagged emails from Microsoft Exchange, Microsoft 365, or Outlook.com accounts. Flags on IMAP accounts remain local to the Outlook desktop application.

Why aren't my flagged Outlook emails showing up in To Do?

This usually happens if the email account is a third-party IMAP/POP account (like 123 Reg, Gmail, or Yahoo) which is unsupported for sync. It can also occur if the 'Flagged email' list connection is toggled off in your Microsoft To Do app settings.

Can I connect my 123 Reg email directly to Microsoft To Do?

Microsoft To Do does not support direct connections to third-party webmail providers. It relies entirely on the Microsoft Exchange server infrastructure to pull in tasks and flagged emails.

Outlook & Email Problems