Microsoft .NET Framework 4.5 是一個針對.NET Framework 4.0的高度兼容的就地更新.
Microsoft .NET Framework 4.5支持的操作係統:
o Windows 7 (x86 and x64)
o Windows 8 Consumer Preview (x86 and x64)
o Windows Server 2008 R2 (x64)
o Windows Server 2008 (x86 and x64)
o Windows Server 8 Beta (x86 and x64)