What is the effect if I Raise my domain functional level to Windows Server 2012 R2 ?

Hi,
my current servers:
Domain Controllers= Windows Server 2012 R2 (current domain functional level is windows 2008 R2)
Mail servers= Exchange 2010 SP3 on Windows 2008 R2
Lync= Lync 2010 on Windows server 2008 R2
What is the effect if I Raise my domain functional level to Windows Server 2012 R2 ?
I am very worried about Exchange & Lync if we do this action
please advice

Do not raise the forest functional level higher if you have or will have any domain controllers running
an earlier version of Windows Server , which is (windows Nt4.0, Window 2000 or windows 2003)
but as a matter of fact I dont see any of those in your network so you can easily upgrade the funtional level without any issues
Listed below link has the table which shows the effects of upgrading the domain functional levels to Windows 2012
http://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels
http://www.arabitpro.com

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