One of the good things that Symantec does with Enterprise Vault is to publish a technote titled “Late Breaking News for Enterprise Vault XYZ”. For example :
Late Breaking News for Enterprise Vault 9.0.1
Late Breaking News for Enterprise Vault 9.0.2
As you can imagine a lot of effort goes in to producing these articles, and they are updated regularly. I know that many on-site Engineers refer to these, and the Compatibility Guide frequently to stay up to date with current happenings.
Do you use the LBN articles?