在20140807時MS宣布在20160112之後將終止.Net 4/4.5/4.5.1的技術支援和安全性的更新，意味著如果有用到上述功能的客戶，勢必得將.Net版本升級到4.5.2。那如果是在4之前的版本呢，則不受任何影響，還是可以用到其lifecycle結束。
在微軟官方說明裡，有寫明各個.Net版本支援的OS版本有哪些，若是想知道更詳細的說明，我節錄4~4.5.1的內容，其他的如果有需要可以進到連結看。
.NET Framework 4: .NET Framework 4 did not ship in any operating system. .NET Framework 4 is supported on Windows Server 2003 SP2, Windows Vista SP2, Windows 7 SP1, Windows Server 2008 SP2, Windows Server 2008 R2 SP1, Windows 8.1 Update, Windows Server 2012, and Windows Server 2012 R2 until January 12, 2016.
.NET Framework 4.5: .NET Framework 4.5 shipped both in Windows 8, Windows Server 2012 and also as a stand-alone redistributable package. .NET Framework 4.5 is supported on Windows Vista SP2, Windows 7 SP1, Windows Server 2008 SP2, Windows Server 2008 R2 SP1, Windows 8.1, Windows Server 2012, Windows Server 2012 R2 until January 12, 2016.
.NET Framework 4.5.1: .NET Framework 4.5.1 is supported on Windows Vista SP2, Windows 7 SP1, Windows Server 2008 SP2, Windows Server 2008 R2 SP1, Windows 8.1 Update, Windows Server 2012, and Windows Server 2012 R2 until January 12, 2016.
.NET Framework 4.5.2: Support for .NET 4.5.2 will follow the support lifecycle policy of the parent operating system. It will be supported as a Windows component on the latest required operating system update for Windows Vista SP2, Windows 7 SP1, Windows Server 2008 SP2, Windows Server 2008 R2 SP1, Windows 8.1 Update, Windows Server 2012, and Windows Server 2012 R2. Microsoft recommends customers upgrade to .NET Framework 4.5.2 in order to receive the highest level of performance, efficiency, and reliability.
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