Hello, thank you for reaching out to Microsoft Q&A.
Try one of the following.
- Open any web browser and launch an incognito tab.
- Paste this link in the address bar and sign in with your Microsoft account. https://account.microsoft.com/profile
- Under 'Profile info', check the Country or region settings, Language, Regional formats, etc...
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Then, in a web browser, go to https://outlook.live.com/mail/0/options/general/timeAndLanguage and set the Language (Country/region), Time zone, and other options to your local settings (for example, English (United States)).
If you are running the new Outlook for Windows app, go to its settings > General > Language and time to set your default language.
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In addition, ensure you have protected your account with a Strong password and enabled two-factor authentication to prevent this issue from happening in the future.
1. Reset your Microsoft account password.
Open an InPrivate/Incognito browser window and use the following link to reset your password: https://account.live.com/ResetPassword.aspx
2. Sign out of your account from all sessions.
Once the password reset is successful, sign in with your account here: https://account.live.com/proofs/Manage
Scroll down until you find Sign out everywhere. Select Sign out everywhere.
3. Enable two-step verification.
On the Security settings page, under Additional security, turn on Two-step verification. Make sure you have at least three security verification methods active.