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How to fully merge a Skype with a Microsoft account
Open your web browser and go to
https://account.microsoft.com/.
If you're currently signed in with your Microsoft account, then sign out.
Click the Sign-in button.
Enter your Skype ID and Skype password to begin the process.
Click Next.
If you have already linked the accounts in the past, you'll get asked to update your information by entering your Microsoft account password.
Click Next.
Click OK to complete the process.
After completing the steps, your Skype account will be fully merged with your Microsoft account. Also, during the process, a Skype alias has been created to allow you to keep using your old username to sign into the service. However, as a result of the merge, you'll now have to use your Microsoft account password to sign in.
Keep in mind that if your Microsoft account happens to be using the same old Skype password, it's also highly recommended to change it as hackers will still be able to access your account.
In case you're not thinking of using the Skype name anymore, you can go to your Microsoft account and disable your current alias (Recommended).