I had an alert about 9 months ago that someone might have accessed my hotmail, I went to check the previous logins and did see some from places in SE Asia but f

I had an alert about 9 months ago that someone might have accessed my hotmail, I went to check the previous logins and did see some from places in SE Asia but from months ago. Mixed in were many logins from an IP address owned by the Microsoft campus at times when I would have been asleep. The account is a backup, and I don't have that mailbox attached to any apps. I emailed their security team asking what was going on but never got a response. After changing the password all the access was stopped. Though I should go back and re-check.