Making SharePoint Offline Solutions(during Site Maintenance)

ASP.NET 2.0 introduced the ability to take an application offline by placing a html file named app_offline.htm at the root of the web application. When this file is present, all requests are routed to the static html page. SharePoint Offline extends this ASP.NEt 2.0 feature to SharePoint, and enables you to schedule when an application will be online/offline as well as the ability to set a custom offline message for each web application.