There is a MyBlog vb sample on
http://msdn.microsoft.com/office/default.aspx?pull=/library/en-us/odc_vsto2005_t
a/html/odc_vstoOutlookMyBlog.asp

to register you can call caspol or
in it you will find a good vb sample (console app) that calls caspol.exe

here is a transalation of that in c#

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.IO;

namespace NFOutlookSecPolicy
{
   class NFOutlookSecPolicy
   {
       private const string addinAssemblyName1 = "OLAddin.dll";

       private const string vstoNode = "VSTOProjects";
       private const string vstoNodeDescription = "OLAddinOutlook Solution
Sample for Microsoft Visual Studio 2005 Tools for the Microsoft Office
System.";

       private const string solutionSampleNode = "OLAddin";
       private const string folderNode = "OLAddinInstallation";
       private const string addinAssemblyNode = "OLAddin";

       static void Main(string[] args)
       {
           if (args.Length >= 2)
           {
               string installOrUninstallOption = args[0];
               string targetDirectory = args[1];

               // Create an instance of the security policy installer object.
               NFOutlookSecPolicy secPolInstaller = new NFOutlookSecPolicy();

               if (installOrUninstallOption.ToLower().Equals("install"))
                   secPolInstaller.InstallCASPolicy(targetDirectory);
               else if
(installOrUninstallOption.ToLower().Equals("uninstall"))
                   // The order of removal of nodes is in the reverse order
as the addition
                   secPolInstaller.UnInstallCASPolicy();
           }
       }

       private string GetFrameworkFolder()
       {

           string frameworkFolder =
Path.Combine(Directory.GetParent(Environment.GetFolderPath(Environment.SpecialFolder.System)).FullName, "Microsoft.NET");
           frameworkFolder = Path.Combine(frameworkFolder, "Framework");

           string version = "v" + Environment.Version.Major.ToString() +
"." + Environment.Version.Minor.ToString() + "." +
Environment.Version.Build.ToString();
           frameworkFolder = Path.Combine(frameworkFolder, version);

           return frameworkFolder;

       }

       private void InstallCASPolicy(string targetDirectory)
       {

           string frameworkFolder = this.GetFrameworkFolder();

           string allFilesInInstallationLocation =
Path.Combine(targetDirectory, "*");
           string addinAssemblyPath1 = Path.Combine(targetDirectory,
addinAssemblyName1);
           //string addinAssemblyPath2 = Path.Combine(targetDirectory,
addinAssemblyName2);

           string arguments = @"-u -q -ag """ + vstoNode + @""" -allcode
Nothing -n """ + solutionSampleNode + @""" - d """ + vstoNodeDescription +
@"""";
           this.AddRemoveSecurityPolicyNode(frameworkFolder, arguments);

           arguments = @"-u -q -ag """ + solutionSampleNode + @""" -url """
+ allFilesInInstallationLocation + @""" Execution -n """ + folderNode + @"""";
           this.AddRemoveSecurityPolicyNode(frameworkFolder, arguments);

           arguments = @"-u -q -ag """ + folderNode + @""" -url """ +
addinAssemblyPath1 + @""" FullTrust -n """ + addinAssemblyNode + @"""";
           this.AddRemoveSecurityPolicyNode(frameworkFolder, arguments);

           //arguments = @"-u -q -ag """ + folderNode + @""" -url """ +
addinAssemblyPath2 + @""" FullTrust -n """ + myBlogsAssemblyNode + @"""";
           //this.AddRemoveSecurityPolicyNode(frameworkFolder, arguments);

       }

       private void UnInstallCASPolicy()
       {

           string frameworkFolder = this.GetFrameworkFolder();

           string arguments = @"-u -q -rg """ + addinAssemblyNode + @"""";
           this.AddRemoveSecurityPolicyNode(frameworkFolder, arguments);

           arguments = @"-u -q -rg """ + folderNode + @"""";
           this.AddRemoveSecurityPolicyNode(frameworkFolder, arguments);

           arguments = @"-u -q -rg """ + solutionSampleNode + @"""";
           this.AddRemoveSecurityPolicyNode(frameworkFolder, arguments);
       }

       private void AddRemoveSecurityPolicyNode(string frameworkFolder,
string arguments)
       {
           ProcessStartInfo procStartInfo = new
ProcessStartInfo("caspol.exe");
           procStartInfo.CreateNoWindow = true;
           procStartInfo.WindowStyle = ProcessWindowStyle.Hidden;
           procStartInfo.WorkingDirectory = frameworkFolder;
           procStartInfo.Arguments = arguments;

           Process caspol = Process.Start(procStartInfo);
           caspol.WaitForExit();

       }

   }
}

here is a caller
1.bat

NFOutlookSecPolicy.exe install "C:\Program Files\XYZ\OLAddin"
pause