WebMatrix allows you to enhance the user experience for your application with a feature called “Task-based extensibility (TBEX) “for Web App Gallery application. This allows you to customize the WebMatrix user interface for a specific application with just a simple XML file included in your package at the root level alongside the manifest.xml and parameters.xml files in the application package. Applications like Wordpress , Umbraco , Dotnetnuke , Joomla to name a few have adopted TBEX in their application packages.
If you receive this error, it can be caused by your .publishsettings file containing invalid characters or XML, or not being the correct format.
There are two kinds of .publishsettings files used by Windows Azure. One is used for publishing credentials for an individual remote web site. The other contains a management certificate used to connect to your Windows Azure subscription.
This error happens when you have no additional MySQL databases available. Free trial subscriptions are limited to 1 MySQL database, unless additional databases are added.
Your subscription with Windows Azure does not have Windows Azure Web Sites enabled.
During sign in, WebMatrix downloads a management certificate in order to retrieve your websites and provision new websites with Windows Azure. Sometimes the certificate expires or needs to be refreshed.
We're sorry, it looks like you experienced an error with Windows Azure sign in and we’re not sure what’s going wrong. Please let us know so we can help troubleshoot.
You may see an error that your subscription has expired. If this happens, you need to extend your subscription.
Your subscription may have a limit to the number of sites or databases that can be created. This will be the case if you're using a free trial account, which is limited to 10 web sites.
You are signing into WebMatrix and you get an error that there are not more certificates available. This happens because as part of sign-in, WebMatrix downloads a management certificate in order to retrieve your websites and provision new websites with Windows Azure. There is a limit of 25 certificates available per subscription.
You can obtain various Microsoft products through the Microsoft Web App Gallery, through the Microsoft Web Platform Installer, or through similar Web Platform Installer-like functionality in other Microsoft software, such as the Microsoft Web Farm Framework and Microsoft WebMatrix. Some of the Microsoft products that you obtain through these means may collect information through Microsoft’s Customer Experience Improvement Program (CEIP) during installation or use of such product. We identify below those specific products that are enrolled in CEIP by default and provide a link to the products’ privacy statements and information on how users can opt-out of CEIP for these products. In addition, we explain what CEIP is and how such information is used to improve our software and services.
Specific Microsoft Products Enrolled by Default in CEIP: (please read below how to opt-out)
Description of Customer Experience Improvement Program
What This Feature Does:
The Customer Experience Improvement Program (“CEIP”) will collect basic information about your hardware configuration and how you use our software and services to identify trends and usage patterns. CEIP also collects includes the type and number of errors you encounter, software and hardware performance, and the speed of services. We will not collect your name, address, or other contact information.
Use of Information:
We use this information to improve the quality, reliability, and performance of Microsoft software and services. For additional, general information about CEIP, see http://go.microsoft.com/fwlink/?linkid=52097.
Choice/Control:
During installation of Microsoft Visual Web Developer 2012, we automatically send information to Microsoft about your installation experience and notify you when an update is available and connect you to the content online. To learn more, see the Visual Web Developer Privacy Statement.
For Microsoft WebMatrix, we do not collect this installation information, but we do notify you when an update is available and connect you to the content online. To learn more, see the WebMatrix Privacy Statement.
During installation of Microsoft Visual Web Developer 2012 and Microsoft WebMatrix, users will be shown a screen on the Web Platform Installer where they can opt-out of participation in CEIP. If you uncheck that box, neither software product will be enrolled in CEIP.
If you choose to participate in CEIP and later change your mind, you can turn off CEIP at any time. To learn how to do so, please review the specific privacy statement for that product listed above.
We’ve just published a minor refresh to WebMatrix, which you can download and use from the Web Platform Installer today.
We did this to fix some of the top customer issues that have been reported since we launched in January.
If you have any more problems or bugs with WebMatrix, please let us know! 
1-13-2011 : These notes will be kept up to date here.
WebMatrix is a brand new web development tool from Microsoft that includes everything you need for website development. Start from open source web applications, built-in web templates or just start writing code yourself. It’s all-inclusive, simple and best of all free. Developing websites has never been easier.
Microsoft WebMatrix Beta is a free web development stack that installs in minutes. It integrates a web server with database and programming frameworks to create a single, integrated experience. You can use WebMatrix Beta to streamline the way you code, test, and publish your own ASP.NET or PHP website, or you can use WebMatrix Beta to start a new website using popular open-source apps like DotNetNuke, Umbraco, WordPress, or Joomla. WebMatrix Beta uses the same powerful web server, database engine, and frameworks environment that will run your website on the internet, which makes the transition from development to production smooth and seamless.
