As many people know I'm not a particularly brilliant or shining star when it comes to SQL.  One thing that I do know though is that it is important to ensure with Enterprise Vault that you have certified/supported service packs.  A few days ago I stumbled across this blog posting:

http://sqlserverbuilds.blogspot.co.uk

You can see build numbers like this:

A handy reference when used in conjunction with the Compatibility Guide.