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Maintenance Mode - User Friendly Message

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I know this is not something desired (not really a HA scenario), but if you have to bring down your site, how do you communicate it to users in a user friendly way?

Well, as we all understand SharePoint is ASP.NET at the end, so app_offline.htm should still work? Now, what is app_offline.htm? It was a new feature included in ASP.NET 2.0. This basically lets ASP.NET 2.0 to shut-down the application, unload the application domain from the server, and stop processing any new incoming requests for that application, sending back all requests for dynamic pages in the application to the app_offline.htm page.