Other laptops using my Microssoft account

Yep - even though your laptop is still linked to your Microsoft account and your partner may still be signed in to Windows on that laptop, you can take steps to check what access remains. Changing your Microsoft account password is an important step, but it does not necessarily terminate every existing session or remove your account from the laptop.

Regarding the first question (confirming what access your partner has via your Microsoft account), you can check several aspects of your Microsoft account remotely.

• Microsoft account devices: Go to https://account.microsoft.com/devices and sign in with your Microsoft account. LAP 1 should appear in your device list. This confirms that the laptop is registered to your account, but it does not necessarily mean your partner can still access your Microsoft account online.
• Microsoft account sign-in activity: Go to https://account.live.com/Activity. This page shows recent sign-in activity, including successful and unsuccessful sign-ins, approximate locations, devices, browsers, and other details. You can use this to identify sign-ins that may have originated from LAP 1. However, the information is not a complete record of everything your partner has done on the laptop.
• OneDrive access: Visit https://onedrive.live.com. You can review your files, folders, sharing permissions, and shared links. If your partner previously had access to your OneDrive through LAP 1, changing your password should help prevent further access, but you should also review your sharing settings and revoke any links or permissions that you no longer need.
• Microsoft account security: Visit https://account.microsoft.com/security. Review your security information, connected authentication methods, and recent activity. You can also use the sign-out options available through your account security settings to help terminate existing sessions.
• Windows account access: Your partner may still have a Windows profile on LAP 1 that was originally associated with your Microsoft account. Even if your password has changed, Windows may retain locally cached credentials. This means your partner could potentially continue accessing files stored locally on LAP 1, including files that were downloaded or synchronized previously.

As far as the second question goes (checking what your partner has viewed), unfortunately that's not the case (with some exceptions). Microsoft does not provide a comprehensive history of files, documents, emails, or websites viewed by another person on a Windows laptop signed in with your Microsoft account.

There exceptions include:

• OneDrive: You may be able to see file activity, such as modifications or sharing events, for certain files. However, Microsoft does not provide a complete audit trail showing every time a person opened, viewed, or downloaded a personal OneDrive file. You cannot reliably determine which files your partner has viewed.
• Microsoft account activity: The sign-in activity page shows account authentication events. It does not show which files were opened, which applications were used, or what your partner did within Windows.
• Outlook: You cannot generally see a comprehensive history of which emails your partner opened or read in your personal Outlook mailbox.
• Local files on LAP 1: If your partner accessed files stored locally on the laptop, you cannot remotely retrieve a comprehensive viewing history through your Microsoft account. Windows event logs or other local records might contain limited information, but you would need access to LAP 1 to inspect them.
• Browser history: If your partner used a browser on LAP 1, you cannot automatically see their browsing history through your Microsoft account. If Edge synchronization was enabled, some browsing data might have synchronized with your account, but that is not a reliable audit mechanism.

As part of remediation, you might consider

• Visit https://account.microsoft.com/devices and identify LAP 1.
• Visit https://account.live.com/Activity and review sign-in activity.
• Use the Microsoft account security settings to sign out everywhere, if available.
• Review OneDrive sharing permissions and revoke anything unnecessary.
• Remove LAP 1 from your Microsoft account's registered devices.
• Enable two-step verification if it is not already enabled.

The most significant limitation is that removing LAP 1 from your Microsoft account does not remotely erase the files already stored on the laptop or guarantee that your partner is signed out of the local Windows profile. Btw. your partner's separate email address is relevant - if they are using their own Microsoft account on LAP 1, their account does not automatically grant them access to your Microsoft account. However, if they are still using your Windows profile, they may retain access to locally cached data.

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hth

Marcin