I wonder if they’ll make it work like Outlook.com’s support for multiple email addresses on the same account which they made a fully first class feature.

Although I primarily use a Gmail for my personal email, I still have a Hotmail address from the 90s.

For at least 10 years now Outlook.com and Microsoft accounts have supported multiple aliases.

This has allowed me to keep my old cringey box name at Hotmail address, but also have a name.surname@outlook.com on the same account, which looks nicer for Microsoft services I use, like Windows login with OneDrive.