Hi steven foy
I understand what you have two email addresses you no longer want to use or receive mail on.
I can see there’s already a Q&A Assist reply under your post. To avoid repeating it, have you already tried removing those addresses from your Microsoft account aliases, and if so, what part did you get stuck on (for example: the address is “Primary,” or you don’t see the Remove option)?
If one of the addresses you want to remove is currently set as your primary alias, Microsoft requires you to choose another alias as primary first, and only then can you remove the old one.
Just to confirm so I can guide you more precisely, are those two addresses aliases on the same Microsoft account (multiple sign-in emails pointing to the same inbox), or are they two separates Outlook.com accounts?
In the meantime, please check Microsoft’s official article for adding/removing aliases: Add or remove an email alias in Outlook.com - Microsoft Support
Looking forward to your reply so I can guide you further.