Skype account (Skype)?

Question

Skype

1. After creating a Microsoft account and linking a Skype account to it, will the old authorization method work?
2. How many Skype accounts can be linked to one Microsoft account?
3. Is the binding process reversible?
4. When using a Microsoft account with two-step authentication, how will the Skype authorization process go?
5. And about the same questions about using a facebook account for skype.
6. Does Microsoft plan to implement two-step for old Skype accounts?

Answer 1

https://support.skype.com/ru/