How can i know for what sites have i registered using my email ?

Hello,

Please go to your Microsoft account privacy settings and check what apps and services were given permissions to access your data https://account.microsoft.com/privacy/activity-...

You can delete all of them, if you wish.

If you worry that you accessed/registered some unsecure websites with your MS account and it could be compromised, it is good to have a full understanding and control over security information of your account. Add alternative email, phone number, set strong password, set two steps verification, use authentication app, etc. The security of your account is tottaly in your hands. Check this articles for more info

https://support.office.com/en-us/article/help-p...

https://support.microsoft.com/en-gb/help/12410/...

Be safe!

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Is there any similiar option for outlook

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Short answer: No

Facebook is a self-contained platform. Outlook.com is an <Email Account> and has no way of knowing where you used your email address (neither does any other <email client>

You might want to monitor your account via this site

';--have i been pwned?

https://haveibeenpwned.com/

While the site name may sound a little hokey - rest assured it's legit. Created and managed by a Microsoft Regional Director/MVP.

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If I used my email to create account on a unsafe site, will my Microsoft account be in trouble ?

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If you use the same password everywhere then you are certainly at risk if a spammer decides to test your email address on Outlook.com.

Required Forum Disclaimer:

The above link is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Using your email address as a Username on a site isn't inherently bad. What would be bad is if you use the same password on that site and for your email.