Microsoft To Do not responding: what to try first

Microsoft To Do usually stops responding because the app is stuck, its cache or sync state is bad, or the device or Microsoft service behind it is having trouble. The quickest safe fixes are to close it completely, reopen it, check for updates, and restart the device. If that does not help, use the device- and account-specific checks below to find out whether the problem is in the app, your connection, or Microsoft’s service.

What “not responding” usually looks like in Microsoft To Do

The exact message varies, or there may be no message at all.

This usually shows up when you open Microsoft To Do, switch lists, check off a task, or try to sync after making changes. The app may open to a blank screen, spin forever, ignore taps or clicks, or freeze as soon as it loads.

Common signs include:

• Endless loading or syncing
• A white or blank screen
• Tasks not checking off
• The app opens but ignores taps or clicks
• One list loads while others do not
• Changes appear locally but never sync

If the app is frozen but still open, the problem is usually the app process, a corrupted cache, a sync problem, or a Microsoft service issue rather than the task list itself.

Before you start

This applies to Microsoft To Do on Windows, iPhone, Android, and the web. Most of the steps below do not need administrator access, but repairing or resetting the Windows app can require permission to change app settings, and clearing browser data may affect sign-in state for that site.

You do not need to back up your tasks before trying the early fixes. Your lists are tied to your Microsoft account, so the safest first steps are the ones that simply restart the app or device.

Before you change anything, do these quick checks:

• Make sure you can still sign in to your Microsoft account.
• If possible, open To Do on another device or in another browser to see whether it works there.
• Check whether other internet-dependent apps or sites are working normally.

Try the fastest fixes first

Start with the safest fixes first. These are the ones most likely to help when To Do is only temporarily stuck, and they do not put your task data at risk.

1. Close Microsoft To Do completely, then open it again. On Windows, use Task Manager if the window will not close normally. On iPhone or Android, swipe the app away from the app switcher. On the web, close the tab and open it again in a fresh tab or a private window. ``text title="Expected result" The app reloads and responds to clicks again `` If it still freezes, the app process may have stalled, so move on.
2. Restart the device. A restart clears temporary memory problems and can fix a background sync hang on Windows, iPhone, Android, and browser devices. ``text title="Expected result" The device starts cleanly and To Do opens normally after you sign back in if needed `` If the problem comes back right away, it is probably not just a temporary device glitch.
3. Check for app updates. Update Microsoft To Do from the Microsoft Store on Windows, the App Store on iPhone, or Google Play on Android. If you use the web, refresh the page and make sure the browser itself is updated. ``text title="Expected result" The app launches in the latest available version and the freeze no longer happens `` If updating does not change anything, the problem may be tied to cache, sync data, or the account.
4. Test your internet connection. Try another site or app that needs the internet. If those also fail, To Do may be waiting on a connection that is unstable or blocked. If everything else works, the problem is less likely to be your network. ``text title="Expected result" Web pages and other apps load normally `` If only To Do is stalled while other services work, keep going with the next section.

If it’s still stuck, repair the app or clear its cache

Use the lightest repair that matches your platform. These steps are still safe, but they are more targeted than a simple restart.

Windows

If you use the desktop app on Windows, try Repair first. It is the least disruptive local fix.

1. Open Settings and go to Apps > Installed apps.
2. Find Microsoft To Do.
3. Open Advanced options if it is available.
4. Choose Repair.

Settings > Apps > Installed apps > Microsoft To Do > Advanced options > Repair

If that works, To Do should launch normally without losing local account data. If it does not, use Reset only after Repair fails.

Reset can remove the app’s local data and force you to sign in again. Your tasks should resync from your Microsoft account, but only use this if Repair did not help.

Settings > Apps > Installed apps > Microsoft To Do > Advanced options > Reset

If the app still will not respond after Reset, the issue is more likely tied to your account, a broader Windows problem, or Microsoft’s service.

Android

On Android, the most useful next step is clearing the app cache. This removes temporary files, not your Microsoft account tasks.

1. Open Settings.
2. Go to Apps.
3. Find Microsoft To Do.
4. Open Storage and cache.
5. Tap Clear cache.

Settings > Apps > Microsoft To Do > Storage and cache > Clear cache

If that does not fix it, try Force stop, then reopen the app. If you still get freezes, uninstalling and reinstalling is reasonable. Because your lists sync to your account, reinstalling is usually safe, but make sure you know your sign-in details first.

iPhone

On iPhone, there is no true cache-clear button for most apps. The safe options are to close the app, restart the phone, and then reinstall the app if needed.

1. Force close Microsoft To Do from the app switcher.
2. Restart the iPhone.
3. If it still hangs, delete the app and install it again from the App Store.

Reinstalling does not normally erase your Microsoft task data, since it comes back when you sign in again. If you have unsynced changes, though, those may not survive if they were never sent to the account.

Web

For the web version, clear site data for To Do or try a private window first.

1. Open Microsoft To Do in a private or incognito window.
2. If it works there, clear site data for the Microsoft To Do site in your browser.
3. Sign in again and test the page.

If a private window works, the problem is often cached browser data, an extension, or a stored sign-in state rather than the service itself.

How to tell whether the problem is your device, your account, your internet connection, or Microsoft

The fastest way to isolate the cause is to change one thing at a time.

If To Do fails on only one device, the problem is probably local to that device: an app install, cache, operating system issue, browser extension, or network setting. Try the same account on another phone, computer, or browser. If it works there, focus on the broken device.

If To Do fails for one account but works when you sign in with a different Microsoft account, the problem is probably tied to the account state or sync data. Sign out, sign back in, and see whether the lists finish syncing. A delayed sync can look like a crash because the app seems frozen while it waits for data.

If To Do fails everywhere, including the web, it may be a Microsoft service issue. That can look like endless loading, lists not opening, or changes not saving. In that case, there may be nothing wrong with your device at all.

If the app only breaks after a sync, assume the sync state is part of the problem. Sign out and sign back in on the affected device, then wait for sync to finish before making more edits.

A quick test pattern helps:

• Same device, different account: points to the account
• Different device, same account: points to the account or service
• Same account on web and app, both broken: points to Microsoft or the account sync state
• One device only: points to the device or its local app data

For the internet connection, the clue is whether other sites and apps work normally. If they do, To Do is less likely to be blocked by your network. If they do not, fix the connection first and then try To Do again.

How to confirm it’s working again

Do a few simple checks before you call it fixed.

1. Open a list that was freezing before.
2. Create a new task.
3. Mark a task complete.
4. Switch to another list and back again.
5. Watch for the sync indicator to finish, if the app shows one.

Lists open normally, clicks respond right away, new tasks appear, and completed tasks stay checked after you move away and return

If you use To Do on more than one device, check the other device too. The strongest sign that the fix worked is when the change you made on one device shows up on the other after a short sync delay. If it works locally but not across devices, the app is only partly healthy and the sync problem is still there.

What to do if Microsoft To Do still won’t respond

If none of the fixes work, check whether Microsoft has a current service issue that could affect sign-in or sync. If the app is broken everywhere, that is the first place to look.

Then collect the details that support can use: the device model, operating system version, where it breaks, whether it happens in the app or web, and whether it affects one account or all accounts. If there is an error message, copy it exactly. If there is no message, describe the symptom plainly, such as “opens to a blank screen” or “tasks never finish syncing.”

After that, contact Microsoft support through the app or Microsoft support channels with those details. If you can still access your tasks in another place, avoid repeated resets until you know whether the issue is local or account-based. That keeps you from making the problem harder to untangle.

Conclusion

If To Do is still frozen after the basic fixes, use the pattern above to narrow it down to one device, one account, your connection, or a Microsoft-side problem. Start with the least risky step that matches your platform, then test whether you can open a list, add a task, and complete one without delay. If you still can’t get past the freeze, contact Microsoft support with the details you collected.

Frequently Asked Questions

Will I lose my tasks if I uninstall Microsoft To Do?

Usually no, because your tasks sync to your Microsoft account. The main risk is losing changes that were never synced before you removed the app.

Why does Microsoft To Do work on my phone but not my computer?

That usually means the problem is local to the computer, such as app data, cache, a browser issue, or a Windows problem rather than your account.

Does Microsoft To Do need the internet to open?

It can open cached data offline, but syncing, loading fresh lists, and saving changes all depend on a working connection.