AKA “Enabling intellisense in Visual Studio for editing the Customizations.xml file”
Download the CRM 2011 SDK. In the SDK you will find a folder called “Schemas”.
Open the “customizations.xml” from the solutions package that you exported out of CRM in Visual Studio. Press the “F4” button (or go to the “Properties” window). Click in Schemas:
Add the “customizationssolution.xsd” schema, and after that you should have intellisense!
Note: in case schema intellisense does not work for you, try adding the following schemas in addition to “customizationsSolution.xsd” file:fetch.xsd