Helped need with Mail after Time Machine restore

so i had a 2010 air that was updated to lion and backed up thru time machine. I just purchased a 2011 air and did a restore from my TM back up and now my mail app doesn't work. When i open it no windows open and i just get the spin wheel. Ive googled online for similar problems and have heard it was an issue with a V2 folder under the library/mail files but i can't find that folder. Also my 2010 air does not have the V2 folder and works fine with mail. Help plz