Roll Back window 7 To Vista - Will Window live mail work

I need to roll back my laptop from win7 to vista.

I am currently using window live mail and in vista it was called window mail.

If I roll back will my email migrate back? Is there a process of doing this?

thanks

I thought live mail was independent of a specific Windows OS version. In other words, Vista does use Windows Mail, but you don't have to use it.

My problem is I use windows live email for my email client and all the emails are stored in C:\Users\Satish\AppData\Local\Microsoft\Windows Live Mail

I don't want to loose the emails if I roll back to vista which use window mail as client ratgher than window live mail