Using this powershell command to check the versions of Exchange:
Get-ExchangeServer | fl name,edition,admindisplayversion
My results from the script were:
Exchange server 1 – Service Pack 2 – no Rollups
AdminDisplayVersion : Version 14.2 (Build 247.5)
Exchange server 2 – Service Pack 1 – no Rollups
AdminDisplayVersion : Version 14.1 (Build 218.15)
Exchange server 3 – Service Pack 1 – RU6
AdminDisplayVersion : Version 14.1 (Build 218.15)
I then checked Help – About Exchange Server 2010 and got:
The above screenshot shows the server has been indeed patched and a rollup applied, however, if you have multiple servers, this only tells you the version of the console you are on.
So then I found this nice script: http://www.bhargavs.com/index.php/2009/12/14/how-do-i-check-update-rollup-version-on-exchange-20xx-server/
Which gave me this result: [in CSV format]
Server Name,Rollup Update Description,Installed Date,ExSetup File Version
<servername>, Update Rollup 6 for Exchange Server 2010 Service Pack 1 (KB2608646) 14.1.355.2, 2011/12/22, 14.01.0355.002
Try the script out yourself and happy Exchange Version Hunting!