to find what exchange version update rollup you have installed use the command:
Get-Command exsetup| %{$_.fileversioninfo}
FileVersion : 14.01.0323.006
ProductVersion : 14.01.0323.006
after yhat you can navigate to technet and verifivy rollup version:
http://technet.microsoft.com/en-us/library/hh135098.aspx