Q: Transfer outlook express email to outlook

The best way is to use Windows Migration Assistant on the PC > http://support.apple.com/kb/HT4796?viewlocale=en_US&locale=en_US It will transfer your Outlook Express messages and accounts to your Mac.

Note that if you have already set up your computer, Migration Assistant will create a new user with the data. To access to this user, go to  > Log Out, and log in the new account. OS X will ask you what account you want to use every time you start up the iMac

You can try a different solution, but it's more difficult > https://discussions.apple.com/docs/DOC-1878

You are welcome

When Mail is closed, it doesn't receive any mail. Just close Mail and you won't receive more mails in this app. To close Mail, open Mail and press Command and Q keys, or right-click the icon in the Dock and close this app

You are welcome