diff --git a/STPTests/STPTests.csproj b/STPTests/STPTests.csproj
index 1ffdffc..877d1e6 100644
--- a/STPTests/STPTests.csproj
+++ b/STPTests/STPTests.csproj
@@ -109,6 +109,7 @@
     <Compile Include="AssemblyInfo.cs">
       <SubType>Code</SubType>
     </Compile>
+    <Compile Include="TestThreadApartmentState.cs" />
     <Compile Include="TestParallelMethods.cs" />
     <Compile Include="TestFalseFillStateWithParams.cs" />
     <Compile Include="TestFillStateWithParams.cs" />
diff --git a/STPTests/TestThreadApartmentState.cs b/STPTests/TestThreadApartmentState.cs
new file mode 100644
index 0000000..ea6d4f3
--- /dev/null
+++ b/STPTests/TestThreadApartmentState.cs
@@ -0,0 +1,47 @@
+using System.Threading;
+using NUnit.Framework;
+using Amib.Threading;
+
+namespace SmartThreadPoolTests
+{
+	/// <summary>
+	/// Summary description for TestThreadPriority.
+	/// </summary>
+	[TestFixture]
+    [Category("TestThreadApartment")]
+	public class TestThreadApartmentState
+	{
+		[Test]
+		public void TestSTA()
+		{
+            CheckApartmentState(ApartmentState.STA);
+		}
+
+		[Test]
+		public void TestMTA()
+		{
+            CheckApartmentState(ApartmentState.MTA);
+		}
+
+	    private static void CheckApartmentState(ApartmentState requestApartmentState)
+	    {
+	        STPStartInfo stpStartInfo = new STPStartInfo();
+	        stpStartInfo.ApartmentState = requestApartmentState;
+
+	        SmartThreadPool stp = new SmartThreadPool(stpStartInfo);
+
+	        IWorkItemResult<ApartmentState> wir = stp.QueueWorkItem(() => GetCurrentThreadApartmentState());
+
+	        ApartmentState resultApartmentState = wir.GetResult();
+
+	        stp.WaitForIdle();
+
+	        Assert.AreEqual(requestApartmentState, resultApartmentState);
+	    }
+
+	    private static ApartmentState GetCurrentThreadApartmentState()
+	    {
+	        return Thread.CurrentThread.GetApartmentState();
+	    }
+	}
+}
\ No newline at end of file
diff --git a/SmartThreadPool/STPStartInfo.cs b/SmartThreadPool/STPStartInfo.cs
index d19a1d9..7454826 100644
--- a/SmartThreadPool/STPStartInfo.cs
+++ b/SmartThreadPool/STPStartInfo.cs
@@ -17,7 +17,7 @@ namespace Amib.Threading
         private bool _enableLocalPerformanceCounters;
         private string _threadPoolName = SmartThreadPool.DefaultThreadPoolName;
 
-	    public STPStartInfo()
+        public STPStartInfo()
         {
             _performanceCounterInstanceName = SmartThreadPool.DefaultPerformanceCounterInstanceName;
             _threadPriority = SmartThreadPool.DefaultThreadPriority;
@@ -37,8 +37,10 @@ namespace Amib.Threading
             _enableLocalPerformanceCounters = stpStartInfo._enableLocalPerformanceCounters;
             _threadPoolName = stpStartInfo._threadPoolName;
             _areThreadsBackground = stpStartInfo.AreThreadsBackground;
+#if !(_SILVERLIGHT)
+            _apartmentState = stpStartInfo._apartmentState;
+#endif
         }
-
 	  
 	    /// <summary>
 	    /// Get/Set the idle timeout in milliseconds.
@@ -160,5 +162,23 @@ namespace Amib.Threading
         {
             return new STPStartInfo(this) { _readOnly = true };
         }
+
+#if !(_SILVERLIGHT)
+
+        private ApartmentState _apartmentState = SmartThreadPool.DefaultApartmentState;
+
+        /// <summary>
+        /// Get/Set the apartment state of threads in the thread pool
+        /// </summary>
+        public ApartmentState ApartmentState
+        {
+            get { return _apartmentState; }
+            set
+            {
+                ThrowIfReadOnly();
+                _apartmentState = value;
+            }
+        }
+#endif
     }
 }
diff --git a/SmartThreadPool/SmartThreadPool.cs b/SmartThreadPool/SmartThreadPool.cs
index 3865d00..af59014 100644
--- a/SmartThreadPool/SmartThreadPool.cs
+++ b/SmartThreadPool/SmartThreadPool.cs
@@ -7,7 +7,7 @@
 //		- Work items return result.
 //		- Support waiting synchronization for multiple work items.
 //		- Work items can be cancelled.
-//		- Passage of the caller thread’s context to the thread in the pool.
+//		- Passage of the caller thread’s context to the thread in the pool.
 //		- Minimal usage of WIN32 handles.
 //		- Minor bug fixes.
 // 26 Dec 2004 - Changes:
@@ -159,13 +159,13 @@ namespace Amib.Threading
 		/// </summary>
 		public const ThreadPriority DefaultThreadPriority = ThreadPriority.Normal;
 
-        /// <summary>
-        /// The default fill state with params. (false)
-
         /// <summary>
         /// The default thread pool name. (SmartThreadPool)
         /// </summary>
         public const string DefaultThreadPoolName = "SmartThreadPool";
+
+        /// <summary>
+        /// The default fill state with params. (false)
         /// It is relevant only to QueueWorkItem of Action<...>/Func<...>
         /// </summary>
         public const bool DefaultFillStateWithArgs = false;
@@ -174,7 +174,16 @@ namespace Amib.Threading
         /// The default thread backgroundness. (true)
         /// </summary>
         public const bool DefaultAreThreadsBackground = true;
-        
+
+#if !(_SILVERLIGHT)       
+        /// <summary>
+        /// The default apartment state of a thread in the thread pool. 
+        /// The default is ApartmentState.Unknown which means the STP will not 
+        /// set the apartment of the thread. It will use the .NET default.
+        /// </summary>
+        public const ApartmentState DefaultApartmentState = ApartmentState.Unknown;
+#endif
+
 		#endregion
 
         #region Member Variables
@@ -619,8 +628,16 @@ namespace Amib.Threading
 					// Configure the new thread and start it
 					workerThread.Name = "STP " + Name + " Thread #" + _threadCounter;
                     workerThread.IsBackground = _stpStartInfo.AreThreadsBackground;
+
+#if !(_SILVERLIGHT) && !(_WINDOWS_CE)
+                    if (_stpStartInfo.ApartmentState != ApartmentState.Unknown)
+                    {
+                        workerThread.SetApartmentState(_stpStartInfo.ApartmentState);
+                    }
+#endif
+
 #if !(_SILVERLIGHT)
-					workerThread.Priority = _stpStartInfo.ThreadPriority;
+                    workerThread.Priority = _stpStartInfo.ThreadPriority;
 #endif
 					workerThread.Start();
 					++_threadCounter;