How to Remove Unknown Devices from Microsoft Account
If you’ve noticed an unfamiliar PC, phone, or browser tied to your Microsoft account, act quickly to remove it and check for signs of unauthorized access.
This guide explains how device lists work, how to remove unknown devices from Microsoft account settings, and what to do if the device keeps coming back.
Microsoft account devices are tied to services like Outlook, OneDrive, Xbox, Windows, and Microsoft 365, so an unknown entry may affect more than one app.
Knowing where to look can help you separate a harmless leftover login from a real security problem.
What counts as an unknown device?
An unknown device is any computer, tablet, phone, or browser session you do not recognize in your Microsoft account device list or recent activity history.
It may be a device you used long ago, a family member’s device, a work PC signed in with your account, or a truly unauthorized sign-in.
- Named devices: Windows PCs, Surface devices, Xbox consoles, and some phones may appear with a recognizable name.
- Browser sessions: Web sign-ins can appear in activity logs even when no device name is shown.
- Old entries: Previous devices may remain listed until removed manually or after account cleanup.
- Suspicious entries: A device from an unfamiliar location, time zone, or operating system may warrant immediate action.
Where Microsoft stores device and sign-in information
Microsoft separates device management, sign-in history, and security settings across a few pages.
The most useful places to check are the Microsoft account device page, the Security dashboard, and the Recent activity page.
- Devices page: Shows linked devices associated with your Microsoft account.
- Security page: Lets you review sign-in attempts, suspicious activity, and recovery options.
- Recent activity: Lists sign-ins, app access, and location details for many Microsoft services.
If you use Windows 11, Xbox, Outlook, or OneDrive, the same account may appear across multiple services, which is why a device can seem “unknown” even when it came from a legitimate login elsewhere.
How to remove unknown devices from Microsoft account
You can remove unfamiliar devices directly from the Microsoft account website.
The exact steps depend on whether the device is listed as a linked device or only appears in recent activity.
Remove a device from the Microsoft account Devices page
- Sign in to your Microsoft account at account.microsoft.com.
- Open the Devices section.
- Review the list for the device name, model, and last activity.
- Select the device you want to remove.
- Choose Remove device or Unlink, if available.
- Confirm the removal when prompted.
After removal, the device should no longer be tied to your account for account-level management.
However, it may still retain local data unless the device itself is reset or signed out separately.
Remove access from recent activity and sessions
If the device is not listed under devices but appears in recent sign-ins, sign out of all sessions and review security events.
- Go to the Microsoft account Security page.
- Open Recent activity.
- Look for unfamiliar sign-ins, IP addresses, locations, or browsers.
- Select any suspicious activity to view details.
- Use the available sign-out or security review options if offered.
This step helps stop active sessions on web-based services such as Outlook.com, Microsoft 365, and OneDrive.
What if the remove option is missing?
Sometimes Microsoft does not show a remove button for every entry.
This is common when the item is a temporary browser session, a managed work or school device, or a device that is still active through another Microsoft service.
- Work or school devices: These are often controlled by an organization’s Microsoft Entra ID or Intune policy.
- Xbox or Windows activation: Some devices remain linked due to licensing, purchases, or activation history.
- Browser-only sign-ins: These usually require signing out of sessions rather than removing a device.
If you cannot remove the entry, focus on securing the account first, then revisit the device list after changing your credentials.
How to secure the account after removing the device
Removing an unknown device is only one part of account protection.
If there is any chance someone else accessed your Microsoft account, strengthen security immediately.
- Change your Microsoft password: Use a new, unique password that is not reused elsewhere.
- Enable two-step verification: Use Microsoft Authenticator, SMS, or another second factor.
- Review recovery information: Confirm your phone number and backup email are correct.
- Check your aliases: Remove any email aliases you do not recognize.
- Sign out everywhere: End active sessions on all devices where Microsoft allows it.
For added protection, consider using a passkey or passwordless sign-in if your device and account support it.
These methods reduce the risk of credential theft from phishing or password reuse.
How to check whether the device was actually yours
Before deleting an entry, verify whether it belongs to one of your own devices or to a shared household account.
Microsoft accounts often sync across personal laptops, phones, and gaming consoles, which can make old entries easy to overlook.
- Check device names used during setup, such as model names or custom labels.
- Compare sign-in times with when you actually used the device.
- Look for familiar locations, Wi-Fi networks, or browsers.
- Review whether the device is connected to your Office, OneDrive, or Xbox activity.
If the device was previously sold, gifted, or recycled, remove it from the account and wipe any linked data if you still have access to it.
How to prevent unknown devices from appearing again
Ongoing prevention matters because a compromised password can repopulate devices and sessions after removal.
Microsoft security tools are most effective when paired with good account hygiene.
- Use unique passwords stored in a reputable password manager.
- Avoid signing into Microsoft services on shared or public computers.
- Turn on sign-in alerts and monitor security notifications.
- Keep Windows, Android, iOS, and browser software updated.
- Remove old recovery methods that no longer belong to you.
If you use a family Microsoft account, confirm that each person has their own profile and that shared devices are managed intentionally.
This reduces confusion when reviewing device lists later.
When to contact Microsoft support
Reach out to Microsoft support if you see repeated suspicious sign-ins, cannot access your account, or suspect account takeover.
Support can help with recovery, account verification, and guidance for compromised Microsoft services.
You should also contact support if the device list shows an issue related to Microsoft 365 licensing, Xbox account ownership, or a managed Windows device that you do not control.
In those cases, removal may depend on the service or organization policy.
Useful account checks after device removal
After you remove unknown devices from Microsoft account settings, verify the rest of the account for signs of tampering.
A short audit can reveal whether the intrusion was limited or part of a broader compromise.
- Review Outlook rules, forwarding settings, and deleted items.
- Check OneDrive sharing links and recently shared files.
- Inspect Xbox purchase history and subscription changes.
- Look at Microsoft Authenticator devices and approved sign-ins.
- Confirm no unfamiliar app passwords or third-party app access remain.
These checks are especially important if the unknown device signed in from a region you do not recognize or if you received password reset emails you did not request.
Common reasons a Microsoft account shows unfamiliar devices
Not every unknown entry means an account breach.
Microsoft accounts can show devices for ordinary reasons that are easy to miss.
- You signed in on a browser and forgot to log out.
- A family member used your account on a shared computer.
- A Windows PC was renamed, making it look unfamiliar.
- An old phone or tablet was restored from backup and reconnected.
- Microsoft services cached an older sign-in session.
Still, if you cannot explain the entry quickly, treat it as suspicious until you verify it.
Frequently checked Microsoft services affected by device access
Because Microsoft accounts connect many products, an unknown device may affect more than one area.
The most commonly impacted services include Outlook, OneDrive, Microsoft 365, Xbox, Windows device management, and Microsoft Store purchases.
That is why understanding how to remove unknown devices from Microsoft account settings is important: it helps protect email, files, subscriptions, and purchased content from unauthorized access.