Sometimes I get a little bit obsessed by version information. Sometimes I get asked what build a particular version of Enterprise Vault is, so then I don't feel quite so obsessed. I used to track some of this stuff manually, but I was pointed in the direction of a really good knowledge base article by a colleague just a few days ago.
How to find Enterprise Vault version information
In that article you can see how to find the information, and what all the version information relates to. So if you want to know what the build is of Enterprise Vault 11.0.1 Cumulative Hotfix 3.. go into that document, and you'll see it is: 11.0.1.3598.
It can be quite useful.