Upgrading your Windows Phone projects for Windows Phone 7 Developer Tools CTP April refresh 

Here are a bunch of breaking issues I encountered on installing Upgrading your Windows Phone projects for Windows Phone 7 Developer Tools CTP April refresh 

For each silverlight for mobile project in your solution you get the following warning (Note: XNA framework apps will not provide a warning but will still require the changes)
• Issue: WarningYou are using a project created by previous version of Windows Phone Developer Tools CTP. Your application may not run properly. Please edit the WMAppManifest.xml file under Properties node and insert the following <Capability> elements between

  <Capabilities></Capabilities> element as shown below. <Capabilities>
  <Capability Name="ID_CAP_NETWORKING" />
  <Capability Name="ID_CAP_LOCATION" />
  <Capability Name="ID_CAP_SENSORS" />
  <Capability Name="ID_CAP_MICROPHONE" />
  <Capability Name="ID_CAP_MEDIALIB" />
  <Capability Name="ID_CAP_GAMERSERVICES" />
  <Capability Name="ID_CAP_PHONEDIALER" />
  <Capability Name="ID_CAP_PUSH_NOTIFICATION" />
  <Capability Name="ID_CAP_WEBBROWSERCOMPONENT" />
  </Capabilities> 

• Solution: You can find WMAppManifest.xml in the Properties folderof your project once found add the sections listed above
• Issue: Push Notifications now require the publisher to be defined
• Solution: This can be done within the WMAppManifest.xml in the Properties folder.  Update the Publisher on <App> E.g 

<App xmlns="" ProductID="{1ac9139d-aa7e-6c70-acf9-c6ceb69632a1}" Title="PinMyApp"
RuntimeType="SilverLight" Version="1.0.0.0" Genre="NormalApp" 
Author="Nick.Harris" Description="Demo" 
Publisher="www.NickHarris.net">

• Issue: Push Notification payload has been updated
• Solution: Update notifications as per the specification here  
• Issue: The property ‘Visible’ does not exist on the type ‘ApplicationBar’ in the XML namespace ‘clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone.Shell’
• Solution: this has bee renamed to IsVisible
• Issue: ‘System.Windows.Navigation.NavigationService’ does not contain a definition for ‘TopLevelNavigationService’
• Solution: change NavigationService.TopLevelNavigationService.Navigate(…) to NavigationService.Navigate(…)  Note: did not find this one in the breaking changes….

Release notes for other  breaking changes are here