I also have old accounts through Microsoft (MSN and Hotmail emails) that I don't want to ditch. My desktop uses Thunderbird to process my emails, and all too often it can't access my Microsoft emails and resetting everything is a royal pain in the butt. So I don't bother anymore.
My workaround? All my Microsoft emails are automatically forwarded to similarly named accounts from another provider. So while
StarSongXYZ@hotmail.com emails might not be easily accessible, it doesn't matter because they're showing up at
StarSongXYZ@yahoo.com.
I occasionally sign into my Microsoft emails to clear out old emails.
BTW, Thunderbird is a meh email app. If anyone knows of a better one, I'd love to learn about it.