diff --git a/src/Magpie/Magpie.Example/Magpie.Example.csproj b/src/Magpie/Magpie.Example/Magpie.Example.csproj
index 44693ac..dd01f95 100644
--- a/src/Magpie/Magpie.Example/Magpie.Example.csproj
+++ b/src/Magpie/Magpie.Example/Magpie.Example.csproj
@@ -109,6 +109,9 @@
       <Name>Magpie</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Resource Include="magpie.png" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/src/Magpie/Magpie.Example/MainWindow.xaml.cs b/src/Magpie/Magpie.Example/MainWindow.xaml.cs
index 27de8c2..d6e5ca3 100644
--- a/src/Magpie/Magpie.Example/MainWindow.xaml.cs
+++ b/src/Magpie/Magpie.Example/MainWindow.xaml.cs
@@ -38,8 +38,8 @@ private void ForceCheck_OnClick(object sender, RoutedEventArgs e)
 
         private static AppInfo MakeAppInfo(int id)
         {
-            var appInfo = new AppInfo("https://dl.dropbox.com/s/j6i7s64ooice8rt/appcast.json", id);
-            appInfo.SetAppIcon("Magpie.Example", "logo64x64.tiff");
+            var appInfo = new AppInfo("https://dl.dropbox.com/s/byii1f3d7qqliwx/appcast_email_enrollment.json?dl=0", id);
+            appInfo.SetAppIcon("MagpieExample", "magpie.png");
             return appInfo;
         }
 
diff --git a/src/Magpie/Magpie.Example/magpie.png b/src/Magpie/Magpie.Example/magpie.png
new file mode 100644
index 0000000..f6b1385
Binary files /dev/null and b/src/Magpie/Magpie.Example/magpie.png differ
diff --git a/src/Magpie/Magpie.latest.nupkg b/src/Magpie/Magpie.latest.nupkg
index 00938a6..9f5d077 100644
Binary files a/src/Magpie/Magpie.latest.nupkg and b/src/Magpie/Magpie.latest.nupkg differ
diff --git a/src/Magpie/Magpie/Magpie.csproj b/src/Magpie/Magpie/Magpie.csproj
index 3183d22..e5012f0 100644
--- a/src/Magpie/Magpie/Magpie.csproj
+++ b/src/Magpie/Magpie/Magpie.csproj
@@ -67,9 +67,11 @@
     <Compile Include="Services\AnalyticsLogger.cs" />
     <Compile Include="Services\AppInfo.cs" />
     <Compile Include="Services\AssemblyAccessor.cs" />
+    <Compile Include="Services\CheckState.cs" />
     <Compile Include="Services\DefaultRemoteContentDownloader.cs" />
     <Compile Include="Services\MainAssembly.cs" />
     <Compile Include="Services\SignatureVerifier.cs" />
+    <Compile Include="Models\Enrollment.cs" />
     <Compile Include="ViewModels\DownloadWindowViewModel.cs" />
     <Compile Include="Services\Helpers.cs" />
     <Compile Include="Services\MagicStrings.cs" />
@@ -81,9 +83,13 @@
     <Compile Include="ViewModels\DelegateCommand.cs" />
     <Compile Include="ViewModels\MainWindowViewModel.cs" />
     <Compile Include="ViewModels\SignatureVerificationWindowViewModel.cs" />
+    <Compile Include="ViewModels\EnrollmentViewModel.cs" />
     <Compile Include="Views\DownloadWindow.xaml.cs">
       <DependentUpon>DownloadWindow.xaml</DependentUpon>
     </Compile>
+    <Compile Include="Views\EnrollmentWindow.xaml.cs">
+      <DependentUpon>EnrollmentWindow.xaml</DependentUpon>
+    </Compile>
     <Compile Include="Views\ErrorWindow.xaml.cs">
       <DependentUpon>ErrorWindow.xaml</DependentUpon>
     </Compile>
@@ -138,6 +144,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="Views\EnrollmentWindow.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="Views\ErrorWindow.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
@@ -164,6 +174,9 @@
   <ItemGroup>
     <Resource Include="Resources\download.png" />
   </ItemGroup>
+  <ItemGroup>
+    <Resource Include="Resources\mail.png" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/src/Magpie/Magpie/Models/Channel.cs b/src/Magpie/Magpie/Models/Channel.cs
index 3590f16..6b832c7 100644
--- a/src/Magpie/Magpie/Models/Channel.cs
+++ b/src/Magpie/Magpie/Models/Channel.cs
@@ -27,6 +27,9 @@ public class Channel
         [DataMember(Name = "dsa_signature", IsRequired = false)]
         public string DSASignature { get; private set; }
 
+        [DataMember(Name = "requires_enrollment", IsRequired = false)]
+        public bool RequiresEnrollment { get; private set; }
+
         // Dates example:
         // e.g. January 30, 2015 18:15:00 +0200
         // 10/03/2015
diff --git a/src/Magpie/Magpie/Models/Enrollment.cs b/src/Magpie/Magpie/Models/Enrollment.cs
new file mode 100644
index 0000000..b56afc4
--- /dev/null
+++ b/src/Magpie/Magpie/Models/Enrollment.cs
@@ -0,0 +1,15 @@
+namespace MagpieUpdater.Models
+{
+    public class Enrollment
+    {
+        public Channel Channel { get; private set; }
+        public bool IsRequired { get; internal set; }
+        public bool IsEnrolled { get; internal set; }
+        public string Email { get; internal set; }
+
+        public Enrollment(Channel channel)
+        {
+            Channel = channel;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Magpie/Magpie/Resources/Styles.xaml b/src/Magpie/Magpie/Resources/Styles.xaml
index 53a1bec..dd981aa 100644
--- a/src/Magpie/Magpie/Resources/Styles.xaml
+++ b/src/Magpie/Magpie/Resources/Styles.xaml
@@ -6,6 +6,8 @@
     <SolidColorBrush x:Key="_magpieSkipBtnFgBrush" Color="Crimson" />
     <SolidColorBrush x:Key="_magpieRemindLaterBtnBgBrush" Color="Transparent" />
     <SolidColorBrush x:Key="_magpieRemindLaterBtnFgBrush" Color="#404040" />
+    <SolidColorBrush x:Key="_magpieSecondaryBtnBgBrush" Color="Transparent" />
+    <SolidColorBrush x:Key="_magpieSecondaryBtnFgBrush" Color="#404040" />
     <SolidColorBrush x:Key="_magpieHeaderFgBrush" Color="Black" />
     <SolidColorBrush x:Key="_magpieMetadataLblFgBrush" Color="#777777" />
     <SolidColorBrush x:Key="_magpieMetadataValueFgBrush" Color="#222222" />
@@ -50,24 +52,32 @@
             </Setter.Value>
         </Setter>
     </Style>
+
     <Style x:Key="_magpiePrimaryBtn"
            BasedOn="{StaticResource _magpieButtonBase}"
            TargetType="Button">
         <Setter Property="Background" Value="{DynamicResource _magpiePrimaryBtnBgBrush}" />
         <Setter Property="IsDefault" Value="True" />
     </Style>
-    <Style x:Key="_magpieSkipBtn"
+
+    <Style x:Key="_magpieSecondaryBtn"
            BasedOn="{StaticResource _magpieButtonBase}"
            TargetType="Button">
         <Setter Property="FontSize" Value="14" />
+        <Setter Property="Background" Value="{DynamicResource _magpieSecondaryBtnBgBrush}" />
+        <Setter Property="Foreground" Value="{DynamicResource _magpieSecondaryBtnFgBrush}" />
+    </Style>
+
+    <Style x:Key="_magpieSkipBtn"
+           BasedOn="{StaticResource _magpieSecondaryBtn}"
+           TargetType="Button">
         <Setter Property="Background" Value="{DynamicResource _magpieSkipBtnBgBrush}" />
         <Setter Property="Foreground" Value="{DynamicResource _magpieSkipBtnFgBrush}" />
     </Style>
 
     <Style x:Key="_magpieRemindLaterBtn"
-           BasedOn="{StaticResource _magpieButtonBase}"
+           BasedOn="{StaticResource _magpieSecondaryBtn}"
            TargetType="Button">
-        <Setter Property="FontSize" Value="14" />
         <Setter Property="Background" Value="{DynamicResource _magpieRemindLaterBtnBgBrush}" />
         <Setter Property="Foreground" Value="{DynamicResource _magpieRemindLaterBtnFgBrush}" />
     </Style>
@@ -75,8 +85,8 @@
     <Style x:Key="_magpieDownloadNowBtn"
            BasedOn="{StaticResource _magpiePrimaryBtn}"
            TargetType="Button">
-           <Setter Property="Padding" Value="10 6" />
-           <Setter Property="FontWeight" Value="500" />
+        <Setter Property="Padding" Value="10 6" />
+        <Setter Property="FontWeight" Value="500" />
     </Style>
 
     <Style x:Key="_magpieWindowHeader" TargetType="TextBlock">
diff --git a/src/Magpie/Magpie/Resources/mail.png b/src/Magpie/Magpie/Resources/mail.png
new file mode 100644
index 0000000..9301a1e
Binary files /dev/null and b/src/Magpie/Magpie/Resources/mail.png differ
diff --git a/src/Magpie/Magpie/Services/AppInfo.cs b/src/Magpie/Magpie/Services/AppInfo.cs
index a90849f..6da3453 100644
--- a/src/Magpie/Magpie/Services/AppInfo.cs
+++ b/src/Magpie/Magpie/Services/AppInfo.cs
@@ -10,6 +10,7 @@ public class AppInfo
         public int SubscribedChannel { get; set; }
         public bool DisableMagpieBranding { get; set; }
         public bool InteropWithWinForm { get; set; }
+        public bool RequiresEnrollment { get; set; }
 
         public void SetAppIcon(string imageNamespace, string imagePath)
         {
diff --git a/src/Magpie/Magpie/Services/CheckState.cs b/src/Magpie/Magpie/Services/CheckState.cs
new file mode 100644
index 0000000..63bdc1a
--- /dev/null
+++ b/src/Magpie/Magpie/Services/CheckState.cs
@@ -0,0 +1,9 @@
+namespace MagpieUpdater.Services
+{
+    internal enum CheckState
+    {
+        InBackground,
+        Force,
+        ChannelSwitch
+    }
+}
\ No newline at end of file
diff --git a/src/Magpie/Magpie/Services/Magpie.cs b/src/Magpie/Magpie/Services/Magpie.cs
index 9c5ff25..5ded570 100644
--- a/src/Magpie/Magpie/Services/Magpie.cs
+++ b/src/Magpie/Magpie/Services/Magpie.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Diagnostics;
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 using System.Windows;
 using MagpieUpdater.Interfaces;
@@ -34,24 +35,24 @@ public Magpie(AppInfo appInfo, IDebuggingInfoLogger debuggingInfoLogger = null,
 
         public async void CheckInBackground(string appcastUrl = null, bool showDebuggingWindow = false)
         {
-            await Check(appcastUrl ?? AppInfo.AppCastUrl, AppInfo.SubscribedChannel, showDebuggingWindow)
-                .ConfigureAwait(false);
+            await Check(appcastUrl ?? AppInfo.AppCastUrl, CheckState.InBackground, AppInfo.SubscribedChannel,
+                showDebuggingWindow).ConfigureAwait(false);
         }
 
         public async void ForceCheckInBackground(string appcastUrl = null, bool showDebuggingWindow = false)
         {
-            await Check(appcastUrl ?? AppInfo.AppCastUrl, AppInfo.SubscribedChannel, showDebuggingWindow, true)
-                .ConfigureAwait(false);
+            await Check(appcastUrl ?? AppInfo.AppCastUrl, CheckState.Force, AppInfo.SubscribedChannel,
+                showDebuggingWindow).ConfigureAwait(false);
         }
 
         public async void SwitchSubscribedChannel(int channelId, bool showDebuggingWindow = false)
         {
             AppInfo.SubscribedChannel = channelId;
-            await Check(AppInfo.AppCastUrl, channelId, showDebuggingWindow, true).ConfigureAwait(false);
+            await Check(AppInfo.AppCastUrl, CheckState.ChannelSwitch, channelId, showDebuggingWindow)
+                .ConfigureAwait(false);
         }
 
-        private async Task Check(string appcastUrl, int channelId = 1, bool showDebuggingWindow = false,
-            bool forceCheck = false)
+        private async Task Check(string appcastUrl, CheckState checkState, int channelId = 1, bool showDebuggingWindow = false)
         {
             _logger.Log(string.Format("Starting fetching remote channel content from address: {0}", appcastUrl));
             try
@@ -59,7 +60,7 @@ private async Task Check(string appcastUrl, int channelId = 1, bool showDebuggin
                 var data = await RemoteContentDownloader.DownloadStringContent(appcastUrl, _logger).ConfigureAwait(true);
                 if (string.IsNullOrWhiteSpace(data))
                 {
-                    if (forceCheck)
+                    if (checkState == CheckState.Force)
                     {
                         ShowErrorWindow();
                     }
@@ -68,13 +69,26 @@ private async Task Check(string appcastUrl, int channelId = 1, bool showDebuggin
 
                 var appcast = ParseAppcast(data);
                 OnRemoteAppcastAvailableEvent(new SingleEventArgs<RemoteAppcast>(appcast));
+
+                if (checkState == CheckState.ChannelSwitch)
+                {
+                    var enrollment = Enroll(appcast, channelId);
+//                  OnEnrolledEvent(enrollment);
+                    if (enrollment.IsRequired && !enrollment.IsEnrolled)
+                    {
+                        // todo: return false
+                        return;
+                    }
+                }
+
                 var channelToUpdateFrom = BestChannelFinder.Find(channelId, appcast.Channels);
-                if (UpdateDecider.ShouldUpdate(channelToUpdateFrom, forceCheck))
+
+                if (UpdateDecider.ShouldUpdate(channelToUpdateFrom, checkState == CheckState.Force))
                 {
                     _analyticsLogger.LogUpdateAvailable(channelToUpdateFrom);
                     await ShowUpdateWindow(channelToUpdateFrom);
                 }
-                else if (forceCheck)
+                else if (checkState == CheckState.Force)
                 {
                     ShowNoUpdatesWindow();
                 }
@@ -89,6 +103,34 @@ private async Task Check(string appcastUrl, int channelId = 1, bool showDebuggin
             }
         }
 
+        private Enrollment Enroll(RemoteAppcast appcast, int channelId)
+        {
+            var channel = appcast.Channels.FirstOrDefault(c => c.Id == channelId);
+            var enrollment = new Enrollment(channel);
+            if (channel == null)
+            {
+                return enrollment;
+            }
+
+            enrollment.IsRequired = channel.RequiresEnrollment;
+            if (enrollment.IsRequired)
+            {
+                ShowEnrollmentWindow(enrollment);
+            }
+
+            // check enrollment
+            return enrollment;
+        }
+
+        protected virtual void ShowEnrollmentWindow(Enrollment enrollment)
+        {
+            var viewModel = new EnrollmentViewModel(enrollment, AppInfo);
+            var window = new EnrollmentWindow { DataContext = viewModel };
+            SetOwner(window);
+            OnWindowWillBeDisplayed(window, enrollment.Channel);
+            window.ShowDialog();
+        }
+
         protected virtual async Task ShowUpdateWindow(Channel channel)
         {
             var viewModel = new MainWindowViewModel(AppInfo, _logger, RemoteContentDownloader, _analyticsLogger);
@@ -159,7 +201,7 @@ protected virtual async Task ShowDownloadWindow(Channel channel)
 
             var savedAt = await viewModel.StartAsync(channel, artifactPath).ConfigureAwait(true);
             finishedDownloading[0] = true;
-            ((DelegateCommand)viewModel.ContinueWithInstallationCommand).RaiseCanExecuteChanged();
+            ((DelegateCommand) viewModel.ContinueWithInstallationCommand).RaiseCanExecuteChanged();
 
             if (string.IsNullOrWhiteSpace(savedAt))
             {
diff --git a/src/Magpie/Magpie/ViewModels/EnrollmentViewModel.cs b/src/Magpie/Magpie/ViewModels/EnrollmentViewModel.cs
new file mode 100644
index 0000000..46808d7
--- /dev/null
+++ b/src/Magpie/Magpie/ViewModels/EnrollmentViewModel.cs
@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Mail;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+using MagpieUpdater.Models;
+using MagpieUpdater.Properties;
+using MagpieUpdater.Services;
+
+namespace MagpieUpdater.ViewModels
+{
+    internal class EnrollmentViewModel : BindableBase 
+    {
+        private string _emailAddress;
+        private readonly Enrollment _enrollment;
+        private string _channelName;
+        private string _appIconPath;
+
+        public string AppIconPath
+        {
+            get { return _appIconPath; }
+            set { SetProperty(ref _appIconPath, value); }
+        }
+
+        public string EmailAddress
+        {
+            get { return _emailAddress; }
+            set
+            {
+                _emailAddress = value;
+                SetProperty(ref _emailAddress, value);
+                EnrollCommand.RaiseCanExecuteChanged();
+            }
+        }
+
+        public string ChannelName
+        {
+            get { return _channelName; }
+            set
+            {
+                _channelName = value;
+                SetProperty(ref _channelName, value);
+                
+            }
+        }
+
+        public DelegateCommand EnrollCommand { get; set; }
+
+        public EnrollmentViewModel(Enrollment enrollment, AppInfo appInfo)
+        {
+            _enrollment = enrollment;
+            AppIconPath = appInfo.AppIconPath;
+            ChannelName = _enrollment.Channel.Build;
+            EnrollCommand = new DelegateCommand(EnrollCommandHandler, CanEnroll);
+        }
+
+        private bool CanEnroll(object obj)
+        {
+            return ValidateEmailFormat();
+        }
+
+        private void EnrollCommandHandler(object obj)
+        {
+            _enrollment.IsEnrolled = true;
+            _enrollment.Email = EmailAddress;
+        }
+
+        private bool ValidateEmailFormat()
+        {
+            if (string.IsNullOrWhiteSpace(EmailAddress))
+            {
+                return false;
+            }
+            try
+            {
+#pragma warning disable 168
+                var m = new MailAddress(EmailAddress);
+#pragma warning restore 168
+                return true;
+            }
+            catch (FormatException)
+            {
+                return false;
+            }
+        }
+
+    }
+}
diff --git a/src/Magpie/Magpie/Views/EnrollmentWindow.xaml b/src/Magpie/Magpie/Views/EnrollmentWindow.xaml
new file mode 100644
index 0000000..cd1bce3
--- /dev/null
+++ b/src/Magpie/Magpie/Views/EnrollmentWindow.xaml
@@ -0,0 +1,92 @@
+<Window x:Class="MagpieUpdater.Views.EnrollmentWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:viewModels="clr-namespace:MagpieUpdater.ViewModels"
+        mc:Ignorable="d"
+        Title="{Binding ChannelName, StringFormat={}{0} Program Enrollment}"
+        d:DataContext="{d:DesignInstance d:Type=viewModels:EnrollmentViewModel}"
+        SizeToContent="Height"
+        ResizeMode="NoResize"
+        ShowInTaskbar="False"
+        Width="390">
+    <Window.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="pack://application:,,,/Magpie;component/Resources/Styles.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/Magpie;component/Resources/Strings.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Window.Resources>
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+        <DockPanel LastChildFill="True">
+            <Image
+                Width="36"
+                Margin="5 0"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Center"
+                DockPanel.Dock="Left"
+                RenderOptions.BitmapScalingMode="HighQuality"
+                Source="{Binding AppIconPath}" />
+            <TextBlock Margin="5 10 10 10"
+                       DockPanel.Dock="Right"
+                       FontSize="15"
+                       Text="{Binding ChannelName, StringFormat={}Please provide your email address to join the {0} Program}"
+                       TextWrapping="Wrap" />
+        </DockPanel>
+        <Grid Row="1">
+            <TextBox Name="EmailAddress"
+                     Margin="10"
+                     Background="#efefef"
+                     HorizontalAlignment="Stretch"
+                     FontSize="14"
+                     Padding="32 4 4 6"
+                     SnapsToDevicePixels="True"
+                     Text="{Binding EmailAddress,
+                                        UpdateSourceTrigger=PropertyChanged}" />
+            <Image Width="26"
+                   Margin="15 10 0 8"
+                   HorizontalAlignment="Left"
+                   VerticalAlignment="Center"
+                   Source="../Resources/mail.png" />
+        </Grid>
+        <TextBlock Grid.Row="2" Margin="10 5 10 10"
+                   FontSize="13"
+                   Foreground="#555"
+                   Text="By enrolling in this program you agree with our EULA."
+                   TextWrapping="Wrap" />
+        <Border Grid.Row="3"
+                Margin="0 10 0 0"
+                BorderBrush="Silver"
+                BorderThickness="0 0 0 0.8"
+                Opacity="0.5"
+                SnapsToDevicePixels="True"
+                UseLayoutRounding="True" />
+
+        <StackPanel Grid.Row="4"
+                    Margin="10"
+                    HorizontalAlignment="Right"
+                    Orientation="Horizontal">
+            <Button
+                MinWidth="120"
+                Content="I don't want to"
+                IsCancel="True"
+                Style="{StaticResource _magpieSecondaryBtn}" Click="CloseWindow" />
+            <Button Margin="5,0,0,0"
+                    Width="80"
+                    Command="{Binding EnrollCommand}"
+                    Content="Enroll"
+                    Click="CloseWindow"
+                    Style="{StaticResource _magpiePrimaryBtn}" />
+
+        </StackPanel>
+    </Grid>
+</Window>
\ No newline at end of file
diff --git a/src/Magpie/Magpie/Views/EnrollmentWindow.xaml.cs b/src/Magpie/Magpie/Views/EnrollmentWindow.xaml.cs
new file mode 100644
index 0000000..82aaafa
--- /dev/null
+++ b/src/Magpie/Magpie/Views/EnrollmentWindow.xaml.cs
@@ -0,0 +1,16 @@
+namespace MagpieUpdater.Views
+{
+    public partial class EnrollmentWindow
+    {
+        public EnrollmentWindow()
+        {
+            InitializeComponent();
+            SetValue(NoIconBehavior.ShowIconProperty, false);
+        }
+
+        private void CloseWindow(object sender, System.Windows.RoutedEventArgs e)
+        {
+            Close();
+        }
+    }
+}