To open a Search window from the Metro screen (also known as the Start screen) in Windows 8 and later versions, you can press the Windows Key + S keyboard shortcut. This will bring up the Search charm, allowing you to search for apps, files, settings, and other content on your computer.

Mail merge is a feature in Microsoft Word that allows you to create personalized documents, such as letters, envelopes, or labels, by combining a main document (containing generic content) with a data source (such as an Excel spreadsheet or a database) that contains specific information for individual recipients. This feature is commonly used for creating mass mailings or personalized communication materials.