sharing windows mail and synchronizing

I have a new Dell xps 420. I have a 750GB hd for Operating system, and a 1IB
drive partitioned with E = documents windows mail with newsgroups and
contacts, favorites
F= Music G= pictures H= videos I = 1tb external backup drive

I just got a HP Pavilion dv7t-100 laptop. It has 2 - 250 gb hard drives. I
would like to share and synchronize Windows Mail and eventually the
computers. But first things first.

I put my contacts into a sharing folder via Live Messenger and sent it to
the laptop. It is now on the laptop as C:\users\ginnyrn\contacts\contacts.In
Windows Mail when I open contacts, it opens the folder that has a folder in
it called contacts and then I have to click on that to see the contacts. I
have 3 identities that I am successfully receiving mail from but the mail
stays in whichever computer I open it in. Can someone please tell me.
I have an internet connection with a Linksys wrt600n router. I am running
Win Vista Ultimate on the desktop and Home Premium on the laptop.

#1 - how do I get rid of the double contacts\contacts?
#2 - should I partition this computer? If so how do I do it with the 2 -
250gb hard drives?
#3 - can I get the mail into synchronization before I tackle the rest of the
computer?
#4 - should I upgrade the laptop to Vista Ultimate?
#5 = whatever you can tell me to help before I get this new machine in
trouble Thank you