(Un)install Lync 2010 error: The object identifier does not represent a valid object. (Exception from HRESULT: 0x800710D8)

Error text:

Executing PowerShell command: Enable-CSComputer -Confirm:$false -Verbose -Report “C:\Users\___\AppData\Local\Temp\2\Enable-CSComputer-[2012_12_21][12_40_50].html”
Command execution failed: The object identifier does not represent a valid object. (Exception from HRESULT: 0x800710D8)

Solution:

Any other IIS websites on this server?

Enter IIS management console, set default webserver port to something different than 80, then restart IIS, then try setup again.

If not need server or website, simply delete.

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