Linking your Skype and Microsoft accounts means you can use the same sign-in details for Skype that you use for all of your Microsoft devices and services. Plus, if you forget your password it’s easier to recover it.
You can only link one Skype account with one Microsoft account, so if you have more than one you need to choose which ones to link.
To link your accounts:
You’re now signed in to Skype with your Microsoft account and your accounts are linked. Next time you sign in, just use your Microsoft account email address and password.
If you have more than one Skype or Microsoft account and you’ve linked the wrong ones, you can easily unlink them, and then link the Skype and Microsoft accounts you want.
Learn more about what happens when you link your accounts.