diff --git a/include/MUtils/OSSupport.h b/include/MUtils/OSSupport.h
index 7db9988..9dbb359 100644
--- a/include/MUtils/OSSupport.h
+++ b/include/MUtils/OSSupport.h
@@ -52,28 +52,27 @@ namespace MUtils
 				unsigned int versionMinor;
 				bool overrideFlag;
 
-				//comparision operators
-				inline bool operator== (const _os_info_t &rhs) const { return (type == rhs.type) && (versionMajor == rhs.versionMajor) && ((versionMinor == rhs.versionMinor)); }
-				inline bool operator!= (const _os_info_t &rhs) const { return (type != rhs.type) || (versionMajor != rhs.versionMajor) || ((versionMinor != rhs.versionMinor)); }
-				inline bool operator>  (const _os_info_t &rhs) const { return (type == rhs.type) && ((versionMajor > rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor >  rhs.versionMinor))); }
-				inline bool operator>= (const _os_info_t &rhs) const { return (type == rhs.type) && ((versionMajor > rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor >= rhs.versionMinor))); }
-				inline bool operator<  (const _os_info_t &rhs) const { return (type == rhs.type) && ((versionMajor < rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor <  rhs.versionMinor))); }
-				inline bool operator<= (const _os_info_t &rhs) const { return (type == rhs.type) && ((versionMajor < rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor <= rhs.versionMinor))); }
+				MUTILS_API bool operator== (const _os_info_t &rhs) const;
+				MUTILS_API bool operator!= (const _os_info_t &rhs) const;
+				MUTILS_API bool operator>  (const _os_info_t &rhs) const;
+				MUTILS_API bool operator>= (const _os_info_t &rhs) const;
+				MUTILS_API bool operator<  (const _os_info_t &rhs) const;
+				MUTILS_API bool operator<= (const _os_info_t &rhs) const;
 			}
 			os_version_t;
 
 			//Known Windows NT versions
-			static const os_version_t WINDOWS_WIN2K = { OS_WINDOWS, 5, 0 };	// 2000
-			static const os_version_t WINDOWS_WINXP = { OS_WINDOWS, 5, 1 };	// XP
-			static const os_version_t WINDOWS_XPX64 = { OS_WINDOWS, 5, 2 };	// XP_x64
-			static const os_version_t WINDOWS_VISTA = { OS_WINDOWS, 6, 0 };	// Vista
-			static const os_version_t WINDOWS_WIN70 = { OS_WINDOWS, 6, 1 };	// 7
-			static const os_version_t WINDOWS_WIN80 = { OS_WINDOWS, 6, 2 };	// 8
-			static const os_version_t WINDOWS_WIN81 = { OS_WINDOWS, 6, 3 };	// 8.1
-			static const os_version_t WINDOWS_WN100 = { OS_WINDOWS, 6, 4 };	// 10
+			MUTILS_API extern const os_version_t WINDOWS_WIN2K;	// 2000
+			MUTILS_API extern const os_version_t WINDOWS_WINXP;	// XP
+			MUTILS_API extern const os_version_t WINDOWS_XPX64;	// XP_x64
+			MUTILS_API extern const os_version_t WINDOWS_VISTA;	// Vista
+			MUTILS_API extern const os_version_t WINDOWS_WIN70;	// 7
+			MUTILS_API extern const os_version_t WINDOWS_WIN80;	// 8
+			MUTILS_API extern const os_version_t WINDOWS_WIN81;	// 8.1
+			MUTILS_API extern const os_version_t WINDOWS_WN100;	// 10
 
 			//Unknown OS
-			static const os_version_t UNKNOWN_OPSYS = { OS_UNKNOWN, 0, 0 };	// N/A
+			MUTILS_API extern const os_version_t UNKNOWN_OPSYS;	// N/A
 		}
 
 		//Known Folders IDs
diff --git a/src/OSSupport_Win32.cpp b/src/OSSupport_Win32.cpp
index f47590d..d67ba16 100644
--- a/src/OSSupport_Win32.cpp
+++ b/src/OSSupport_Win32.cpp
@@ -140,6 +140,37 @@ g_os_version_lut[] =
 	{ MUtils::OS::Version::UNKNOWN_OPSYS, "N/A" }
 };
 
+//OS version data dtructures
+namespace MUtils
+{
+	namespace OS
+	{
+		namespace Version
+		{
+			//Comparision operators for os_version_t
+			bool os_version_t::operator== (const os_version_t &rhs) const { return (type == rhs.type) && (versionMajor == rhs.versionMajor) && ((versionMinor == rhs.versionMinor)); }
+			bool os_version_t::operator!= (const os_version_t &rhs) const { return (type != rhs.type) || (versionMajor != rhs.versionMajor) || ((versionMinor != rhs.versionMinor)); }
+			bool os_version_t::operator>  (const os_version_t &rhs) const { return (type == rhs.type) && ((versionMajor > rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor >  rhs.versionMinor))); }
+			bool os_version_t::operator>= (const os_version_t &rhs) const { return (type == rhs.type) && ((versionMajor > rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor >= rhs.versionMinor))); }
+			bool os_version_t::operator<  (const os_version_t &rhs) const { return (type == rhs.type) && ((versionMajor < rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor <  rhs.versionMinor))); }
+			bool os_version_t::operator<= (const os_version_t &rhs) const { return (type == rhs.type) && ((versionMajor < rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor <= rhs.versionMinor))); }
+
+			//Known Windows NT versions
+			const os_version_t WINDOWS_WIN2K = { OS_WINDOWS, 5, 0 };	// 2000
+			const os_version_t WINDOWS_WINXP = { OS_WINDOWS, 5, 1 };	// XP
+			const os_version_t WINDOWS_XPX64 = { OS_WINDOWS, 5, 2 };	// XP_x64
+			const os_version_t WINDOWS_VISTA = { OS_WINDOWS, 6, 0 };	// Vista
+			const os_version_t WINDOWS_WIN70 = { OS_WINDOWS, 6, 1 };	// 7
+			const os_version_t WINDOWS_WIN80 = { OS_WINDOWS, 6, 2 };	// 8
+			const os_version_t WINDOWS_WIN81 = { OS_WINDOWS, 6, 3 };	// 8.1
+			const os_version_t WINDOWS_WN100 = { OS_WINDOWS, 6, 4 };	// 10
+
+			//Unknown OS
+			const os_version_t UNKNOWN_OPSYS = { OS_UNKNOWN, 0, 0 };	// N/A
+		}
+	}
+}
+
 static bool verify_os_version(const DWORD major, const DWORD minor)
 {
 	OSVERSIONINFOEXW osvi;
diff --git a/src/Taskbar7_Win32.cpp b/src/Taskbar7_Win32.cpp
index d86bd53..9b8501d 100644
--- a/src/Taskbar7_Win32.cpp
+++ b/src/Taskbar7_Win32.cpp
@@ -20,8 +20,9 @@
 // http://www.gnu.org/licenses/gpl-2.0.txt
 ///////////////////////////////////////////////////////////////////////////////
 
-//Internal
+//MUtils
 #include <MUtils/Taskbar7.h>
+#include <MUtils/OSSupport.h>
 #include <MUtils/Exception.h>
 
 //Qt
@@ -40,7 +41,11 @@
 
 #define INITIALIZE_TASKBAR() do \
 { \
-	if(!initialize()) \
+	if(!p->supported) \
+	{ \
+		return false; \
+	} \
+	if(!(p->initialized || initialize())) \
 	{ \
 		qWarning("Taskbar initialization failed!"); \
 		return false; \
@@ -59,7 +64,15 @@ namespace MUtils
 		friend class Taskbar7;
 
 	protected:
+		Taskbar7_Private(void)
+		{
+			taskbarList = NULL;
+			supported   = false;
+			initialized = false;
+		}
+
 		ITaskbarList3 *taskbarList;
+		volatile bool supported;
 		volatile bool initialized;
 	};
 }
@@ -73,13 +86,14 @@ MUtils::Taskbar7::Taskbar7(QWidget *const window)
 	p(new Taskbar7_Private()),
 	m_window(window)
 {
-	p->taskbarList = NULL;
-	p->initialized = false;
-
 	if(!m_window)
 	{
 		MUTILS_THROW("Taskbar7: Window pointer must not be NULL!");
 	}
+	if(!(p->supported = (OS::os_version() >= OS::Version::WINDOWS_WIN70)))
+	{
+		qWarning("Taskbar7: Taskbar progress not supported on this platform.");
+	}
 }
 
 MUtils::Taskbar7::~Taskbar7(void)