Summary

Hotmail account was temporarily locked due to “unusual activity”.

Microsoft is aware of this ongoing issue and it has been fixed now.

Resolution

Please reset your account password again and click the link provided below to verify the account.

Click here: Check your Microsoft account reputation

References

https://answers.microsoft.com/en-us/outlook_com/forum/all/hotmail-account-repeatedly-locked/b6fd3702-e794-401c-a5c7-b8c8da705b8b?page=15