To view the build number for the version of Exchange 2010 or 2007  that you’re running, run the following command in the Exchange Management Shell:

Get-ExchangeServer | fl name,edition,admindisplayversion

Exchange Server 2010 SP3 build numbers

Product name Release date Build number
Microsoft Exchange Server 2010 Service Pack 3 (SP3) February 12, 2013 14.03.0123.004

Check your all other build numbers in this link: 

http://technet.microsoft.com/en-us/library/hh135098(v=exchg.141).aspx