I see book authors, editors, bloggers, press, team members, and occasionally even a VP misspell our products, technologies, and features that I thought I would build and maintain a list of the correct capitalization and spelling of the most commonly misspelled Microsoft products and technologies. Sources: Internal site (brandtools) and the Microsoft Trademarks Web site. Last updated: April 27, 2010 Incorrect Correct .net or .Net .NET .Net framework 4.0, .NET framework 4.0 .NET Framework AdCenter, Ad Center, Adcenter adCenter Ado.net, ADO.Net ADO.NET Asp.net, ASP.Net ASP.NET Asp.Net ajax, Asp.NET Ajax ASP.NET AJAX Asp.Net Mvc ASP.NET MVC Biz Spark, Bizspark BizSpark Clear Type, Clear type, Cleartype ClearType Directaccess, Direct Access DirectAccess Direct Show, Directshow DirectShow Direct X DirectX Dream Spark, Dreamspark DreamSpark Home Group, Home group HomeGroup HotMail, Hot Mail Hotmail Info Path, Infopath InfoPath Intellisense, Intellisense IntelliSense Iron Ruby IronRuby Kin KIN Linq LINQ MSN Messenger Windows Live Messenger One Note, Onenote OneNote Open type, Opentype OpenType PlayTo, Play to Play To Power Point, Powerpoint PowerPoint Powershell, Power Shell PowerShell Sea Dragon, Seadragon SeaDragon Sharepoint, Share Point SharePoint Silver Light, SilverLight Silverlight Skydrive, Sky Drive SkyDrive Sql Server SQL Server Visual Basic .net (the .net was removed in the 2005 version) Visual Basic Visual C# Express 2010 or Visual Basic Express 2010 or Visual C++ Express 2010 Visual version 2010 Express as in Visual C# 2010 Express, Visual Basic 2010 Express Visual Studio 2010 Team Foundation Server Visual Studio Team Foundation Server 2010 Visual Studio Ultimate 2010 or Visual Studio Professional 2010 Visual Studio 2010 version, as in Visual Studio 2010 Ultimate, Visual Studio 2010 Professional WebSite Spark, Website spark Website Spark Win 32 Win32 Windows Mobile (except when referring to previous versions like 5.0 or 6), Windows phone 7 Series Windows Phone Xaml XAML XBOX, xbox Xbox Xbox Live, XBOX Live Xbox LIVE Caveats These guidelines dont apply to URLs (ex: www.asp.net) or to code namespaces, variables, and classes should follow the .NET Framework naming guidelines. This list only covers capitalization/spacing rules, it doesnt cover the correct usage of (tm) or symbols or the correct word usage rules. For those, refer to the trademark Web site. Also note that I have no idea why we are so inconsistent say on keeping features/brands two words versus one word or the order of product/version/year.Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.