To see all your account names and apps installed by each account, just follow as described. From Windows 8 Modern UI (Metro Start Screen) open Store App. In the Store, right click and choose “Your apps”. Here you’ll see all your apps and accounts.

To remove an old account, open Store app and press Win +C to open Charms bar. Then, click “Settings” and Choose “Accounts”. It’ll lists all your account names at the bottom of the page.

Now select the old account and then click “Remove” and confirm the action. Important Note: Removing an account will also remove all your paid apps. You need to purchase them again to install.