One of the useful things that the Vault Information dialog gives you is information on the Operating System that the Enterprise Vault Outlook Add-in is running on. You can see it in the following dialog :
You also see key things like :-
Operating System + Service Pack information
Version of Outlook
Exact version of Internet Explorer
Exact version of Enterprise Vault Outlook Add-in installed (in my case above, I’m using 8 SP 3)
Whether outlvbs.dll is available (this is needed for the EV forms to function)