The Compatibility Guide is an accumulation of all things relating essentially to the CERTIFICATION of other “moving parts” with Enterprise Vault components. For example it has information relating to the Enterprise Vault Outlook Add-in and the various versions of Outlook which are supported.. It has client Operating Systems listed… It has storage devices listed… It has different versions of Enterprise Vault listed so you can see where support started for a particular thing (eg Exchange 2007).
It should be used by everyone in my opinion, though, as with many things, there are mistakes. If you spot one, or you think you’ve spotted one, you should contact Support and discuss it. If there is something in there which isn’t clear, you should contact Support and discuss it. Of course, unofficially, you can also ask on the Symantec Connect forums.
Here is a link to the article which contains the current guide :