Today I went again to the computer mall. I check again several laptop Sony, HP, Lenovo and Apple. So far only the Macbook offers a large display AND a battery life over 5 hours, which are my main requirements, all others specs being equal.

My main problem is now migrating from TheBat to Apple mail. After little search on the internet I found this answer, but haven't a MacBook I can't check if it will work or not. Any opinion about that ?

... Secondly with The Bat! you can export into unix mailbox format. If i am not mistaken - I haven't got apple maschine - the Mac mail can import from unix mailbox format...