Managing personal Outlook.com account settings, security, and privacy
Hi KYLESONG2
Thanks for reaching out! My name is Dane and i'm an Independent Advisor and a Microsoft user like you.
I would not worry about Successful Syncs, these are just servers that Microsoft uses for cloud computing, the ones you need to worry about are Successful SIGN IN from an unknown IP , since those sign ins are made by real people logging in or trying to log in to your account.