Hi @TIM POKORSKI ,
Welcome to our forum!
Looks like your case is more related to your MSN accounts and outlook.com account, please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client. Based on my research, i found an official article which mentioned several methods to protect your Outlook.com accounts, such as enabling 2-Step Authentication, more information: Help protect your Outlook.com email account.
Hope to help you. If the above doesn't help or you have more questions about your MSN accounts and outlook.com account, it's suggested that you could post your case in dedicated forum for Outlook.com for more professional advice.
Thanks for your kindly understanding and support!
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