Is your old ev still active and how old ev is old ev i.e. what version? and how many users are you talkin about?

There are several ways depending on the amount of data. in short if you have manageable data then use PST export from your old EV and PST import into your new EV. you can use EV built-in feature Move Archives, depending on the version of your old ev and new ev.

If you have lots of data then I would suggest using third party software such as Transvault, but this will at a high cost.

yes its active!!!

But how can i get the details..Is there any way i can trace the EV details??

on your old ev..open the EV admin console and right-click on the Enterprise vault at the top left, choose properties/about EV (or something like that) and it will tell you what version you are using.

On your old ev server logon as vault service account and open http://evservername.domain.local/enterprisevault/usage.asp it will tell you the user and data details.

i dont know the old EV!!

i need to trace it through outlook , is that possible??

There is no EV Tab!!

How do i do that??

if there's no EV tab the you are not enabled for EV or/and the EV client is not installed.