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The specified forest functional level is invalid. "Lync Server" requires forests running in Windows 2003 mode or higher.

Update:11-30Source: network consolidation
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Dear Support Team,
i am having the error ''The specified forest functional level is invalid. "Lync Server" requires forests running in Windows 2003 mode or higher'' from lync 2013 during the schema master prepare on windows server 2008r2 and my forest functional
level are 2008r2.. so can you help me please...?

The Best Answer

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Dear Support Team,
in my network there are one forest and two domain controller (primary and secondary).. my domain functional
level is windows server 2008r2.. but i am still receiving error.. when i hit the run button for schema prepare its says:
ServerSchemaPrepareTask execution failed on an unrecoverable error.
and when i open log it sasys: 
Error: The specified forest functional level is invalid. "Lync Server" requires forests running in Windows 2003 mode or higher.
kindly help me
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