在Windows2008 R2 SP1上安裝Lync時，會安裝失敗，報如下錯誤：
Name of prerequisite: Wmf2008R2 MM/DD/YYYY HH:MM:SS AM
Name of prerequisite: Wmf2008R2 MM/DD/YYYY HH:MM:SS AM
Type of prerequisite: exe MM/DD/YYYY HH:MM:SS AM
Method used to check prerequisite state: WmfNeeded2008R2() MM/DD/YYYY HH:MM:SS AM
Result of state check: True MM/DD/YYYY HH:MM:SS AM
Executing external command: C:\Windows\system32\dism.exe /online /norestart /add-package
/packagepath:C:\Windows\servicing\Packages\Microsoft-Windows-Media-Format-
Package~31bf3856ad364e35~amd64~~6.1.7600.16385.mum /ignorecheck MM/DD/YYYY HH:MM:SS AM
Installation result: -2146762496 MM/DD/YYYY HH:MM:SS AM
Error: Prerequisite installation failed: Wmf2008R2
Details
Type: PrereqInstallFailed
Stack Trace
at Microsoft.Rtc.Internal.Tools.Bootstrapper.BootstrapperTask.AddMsiPrereq(String prereqName)
at Microsoft.Rtc.Management.Internal.Utilities.LogWriter.InvokeAndLog[T](Action`1 action, T arg)
Type of prerequisite: exe MM/DD/YYYY HH:MM:SS AM
Method used to check prerequisite state: WmfNeeded2008R2() MM/DD/YYYY HH:MM:SS AM
Result of state check: True MM/DD/YYYY HH:MM:SS AM
Executing external command: C:\Windows\system32\dism.exe /online /norestart /add-package
/packagepath:C:\Windows\servicing\Packages\Microsoft-Windows-Media-Format-
Package~31bf3856ad364e35~amd64~~6.1.7600.16385.mum /ignorecheck MM/DD/YYYY HH:MM:SS AM
Installation result: -2146762496 MM/DD/YYYY HH:MM:SS AM
Error: Prerequisite installation failed: Wmf2008R2
Details
Type: PrereqInstallFailed
Stack Trace
at Microsoft.Rtc.Internal.Tools.Bootstrapper.BootstrapperTask.AddMsiPrereq(String prereqName)
at Microsoft.Rtc.Management.Internal.Utilities.LogWriter.InvokeAndLog[T](Action`1 action, T arg)
在Windows2008 R2上安裝Lync時，安裝程序會自動安裝組件Windows-Media-Format，然後再安裝Lync程序。
但在Windows2008 R2 SP1，lync安裝程序在安裝組件Windows-Media-Format時會報錯導致安裝失敗。
這是因爲升級到R2 SP1後Windows-Media-Format的版本從6.1.7600.16385變成了6.1.7601.17514，而集成在
Lync安裝程序裏面的調用命令是：
Executing external command: C:\Windows\system32\dism.exe /online /norestart /add-package
/packagepath:C:\Windows\servicing\Packages\Microsoft-Windows-Media-Format-
Package~31bf3856ad364e35~amd64~~6.1.7600.16385.mum /ignorecheck
所有因找不到組件而安裝失敗。
因此我們要在安裝lync之前，先手動安裝該組件並重啓後再安裝Lync，安裝該組件命令如下：
%systemroot%\system32\dism.exe /online /add-package /packagepath:%windir%\servicing\Packages\Microsoft-Windows-Media-Format-Package~31bf3856ad364e35~amd64~~6.1.7601.17514.mum /ignorecheck
KB Article 2522454: Lync Server 2010 Setup or Remove Lync Components Fails on Windows Server 2008 R2 SP1