First, log in to the account to know how to unarchive and extend the side tab to choose All mail to activate the All mail view. Then, right-click the archived mail which you want to unarchive. When you right-click on that option, you can move to inbox. Click the option and move the archive mail to the inbox. The unarchived messages will be displayed in your inbox. You can also unarchive bulk messages by clicking select all conversations in All mail. The bulk emails can be seen in the inbox once the above action is done.