These emails were visible in my "sent items" folder and I automatically received email advice from Microsoft to change my password immediately, which i did.

Now this week, I have received notification from many of my contacts that more emails have been sent from the same hotmail account, however this time they cannot be seen in my sent items. The subject title of these emails range from "Yo, ..."(person's name), "Hiya..." (person's name), "Sup..." (person's name), etc...

I have again changed my email passwords and run a few different Anti virus scans with no major threats being detected.

Please advise what I need to do to ensure this does not keep happening.

Thanks