Microsoft To Do may show flagged emails only for supported work or school Exchange mailboxes. If they’re missing, the usual causes are account eligibility, mail sync limits, or an Outlook folder or view that hides the flagged message. Ignoring the cause wastes time and leaves flagged tasks out of sight, which can break follow-up and deadlines. This guide walks you through account checks first, then sync limits, then Outlook folder and view settings.

Why are flagged emails missing?

Why are flagged emails missing?
Microsoft To Do shows a flagged email list in a desktop app screenshot

Missing flagged emails usually point to one of three issues: the mailbox is not a supported work or school account, the message has not synced yet, or Outlook is hiding the related view or search folder. Start with account eligibility, then check whether the message is within the supported sync set, and only then repair Outlook views.

What the flagged email list does

Microsoft To Do can show a separate flagged email list after the feature is enabled. Those items show the email title and body text, and each task includes a shortcut back to Outlook so you can open the message from To Do and act on it there.

Fastest first check

  1. Open Outlook and confirm the message is flagged in the same mailbox you use in To Do.
  2. Check whether that mailbox is a work or school Outlook account.
  3. Refresh Outlook and Microsoft To Do, then wait a moment and check again.

Say your team mailbox shows a red flag in Outlook, but To Do is empty. That usually means the account or view is wrong, not that the flag was lost. A personal Outlook.com sign-in and a work mailbox sign-in are different sources.

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

If To Do is missing flagged mail, the first question is whether the account is eligible. Flagged email sync is for work or school Outlook accounts, and Microsoft tied the feature to To Do version 1.52, with Windows and web support mentioned for that update. If eligibility is right, move to limits and Outlook views.

Account type mismatch

  1. In Outlook, confirm the mailbox is a work or school account, not a personal Microsoft account.
  2. In Microsoft To Do, sign in with the same work or school identity used in Outlook.
  3. If Outlook shows multiple accounts, open the flagged message from the account that should sync.
  4. Check whether the flagged email list appears after the app refreshes.

Sync delay or stale views

  1. Close and reopen Outlook.
  2. Refresh Microsoft To Do.
  3. Wait for the next sync cycle before retrying.
  4. Confirm the app update level includes version 1.52 support.

Suppose a message was flagged five minutes ago in Outlook on the web, but To Do still has no task. That fits a sync delay. Wait, refresh, then recheck the same mailbox before moving to folder repair.

How do I get Outlook flagged emails to sync to Microsoft To Do?

To get sync working, you need the right mailbox, the right app support level, and a flagged message that fits the supported sync window. Microsoft says flagged emails from work or school Outlook accounts can sync as tasks in To Do, and the task can include the email title, body text, and a shortcut back to Outlook.

Set up the mailbox and app

  1. Open Microsoft To Do with the same work or school account used in Outlook.
  2. Update Microsoft To Do to version 1.52 or later.
  3. Open Outlook and flag the message you want to follow up.
  4. Return to To Do and check the flagged email list.

Flag the message in Outlook

  1. Open the email in Outlook.
  2. Right-click the message and choose a due date option such as Today or Tomorrow, if needed.
  3. Use the flag control to mark the message for follow-up.
  4. Open To Do and confirm the task appears in the flagged email list.

Use task actions after sync

  1. Open the flagged item in To Do.
  2. Add a due date or reminder.
  3. Mark it complete when finished.
  4. Use the shortcut back to Outlook if you need the full message thread.

Why are only some flagged emails showing in To Do?

Partial sync usually means the message set exceeds the supported sync window or one of the flagged emails is outside the allowed set. Microsoft’s support document allowed up to 10 emails at any given time, and the supported messages were limited to the last two weeks. Check the newest, most recent flags first.

Flagged email limit

  1. List the flagged messages in Outlook by recency.
  2. Keep the newest items in the candidate set first.
  3. Remove older flags from messages that no longer need follow-up.
  4. Check To Do again after Outlook syncs the smaller set.

Two-week window

  1. Open the flagged message in Outlook and check when it was originally received.
  2. Compare that message date with the last two weeks.
  3. Flag a recent message and see whether it appears in To Do.
  4. If the older mail still matters, keep it in Outlook follow-up, not as the expected To Do task.

How do I turn on flagged email sync in Microsoft To Do?

Turn on sync by using a supported work or school Outlook mailbox and the To Do build that introduced the feature. Microsoft tied flagged email sync to version 1.52 and noted Windows and web support with that update. After that, the flagged email list should appear as a separate task list once the feature is enabled.

Enable and verify the list

  1. Update Microsoft To Do to version 1.52 or later.
  2. Sign in with the supported work or school account.
  3. Open the app list and look for the flagged email list.
  4. Flag a fresh Outlook message and confirm it appears in the list.

When the list appears but stays empty

  1. Confirm the Outlook message is in the same mailbox as the To Do sign-in.
  2. Check that the message is recent enough to fit the sync window.
  3. Wait for the next sync pass.
  4. Refresh the app and recheck the list.

Outlook folder issues

Outlook folder issues
Person using a laptop with an email inbox on screen

If the Outlook side is broken, To Do may still look empty because the source view is missing or hidden. Outlook includes a To do icon in the left pane and a Flagged email tab. If the related search folder is gone, rebuild the For Follow Up view so flagged mail can surface again. (Microsoft Support)

Find the Outlook views

  1. Open Outlook and look for the To do icon in the left pane.
  2. Select the Flagged email tab.
  3. Check whether the expected flagged mail is visible there.
  4. Return to To Do and refresh the flagged email list.

Recreate the For Follow Up folder

  1. Open Outlook’s folder or search-folder controls.
  2. Select New Search Folder.
  3. Choose the Mail flagged for follow up search folder type.
  4. Save the folder and recheck flagged mail in Outlook and To Do.

Why a view fix matters

If Outlook cannot surface the message through its flagged-mail view, To Do has little to sync. A missing search folder is common after layout changes or profile issues, and recreating it is often faster than rebuilding the whole mailbox.

Symptom Likely cause Verification step Fix
Flagged emails never appear in To Do Work or school account mismatch Check whether Outlook and To Do are signed into the same work or school mailbox Sign into both apps with the supported mailbox
Flagged emails appear late Sync delay Refresh Outlook and To Do, then wait for the next sync cycle Retry after a short wait and confirm the update level
Only a few flagged messages show up More than 10 flagged emails are pending Count the current follow-up messages in Outlook Trim the candidate set to the newest items first
Older flagged mail is missing Email is older than two weeks Check the original received date on the message Use a newer message or keep the item in Outlook follow-up
Outlook shows no flagged-mail view Missing Flagged email or For Follow Up view Open the Outlook left pane and search-folder settings Recreate the Mail flagged for follow up search folder

Still not working?

Still not working?
A Microsoft To Do screen shows the Flagged email list

If the flagged email list still does not appear, verify that your tenant allows Outlook To Do integration and that your mailbox is a supported Exchange work or school account. If the account is managed by your organization, ask an administrator whether policy blocks flagged-mail sync or the To Do integration itself.

Escalation ladder

  1. Confirm the mailbox type again in Outlook.
  2. Check whether the message falls within the supported sync set.
  3. Recreate the Outlook search folder.
  4. Sign out and sign back in with the same work or school identity.
  5. Ask your Microsoft 365 or Exchange admin to review mailbox and To Do policy settings.

A common first-timer mistake is mixing a personal Outlook.com account with a work mailbox and expecting the same flagged items to sync. Those are different account types, so the mailbox source has to match the To Do sign-in before any other fix can work.

Keep reading

Frequently asked questions

Does Microsoft To Do only show flagged emails from work or school accounts?

Yes. Flagged email sync is for supported work or school Outlook accounts. Personal Microsoft accounts are not the supported source for this feature, so a personal mailbox will not sync the same flagged-email tasks into To Do. (Microsoft Learn)

What is the limit for flagged emails in Microsoft To Do?

Microsoft’s support document allowed up to 10 emails at any given time, and the supported items were limited to the last two weeks. If you exceed either boundary, trim the candidate set in Outlook and check the newest messages first.

Why did my flagged email disappear from Microsoft To Do?

It may have fallen outside the supported sync window, or the Outlook view changed and no longer surfaces the message. Reopen Outlook, check the Flagged email tab, and recreate the Mail flagged for follow up search folder if needed.