get the version of your exchange server rollup and all

The most conclusive way to get the version of your exchange server, rollup and all, is to check the file version of ExSetup.exe in the BIN folder.

 

you can use this Pshell one liner:

GCM exsetup |%{$_.Fileversioninfo}

 

find exchange patches and build dates here:

 

Link to Exchange versions/patches and build dates

http://eightwone.com/references/versions-builds-dates/