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.