I have just started to use a new laptop and am looking to wind down the old one. The new uses Outlook 2010, the old Outlook 2002 SP3. I have (perhaps unwisely) used the same e-mail address for both. It looks as though the old laptop is holding the main account and the new one is simply holding a copy - I have summised this from the fact that nothing goes to 'sent items' on the new one (even though the appropriate box is ticked in Options/Mail/Save Messages), but items sent from the new laptop appear in the inbox on the old one.

How do I ensure that the new laptop takes over the main e-mail account? Answers in words of one syllable, please as I suffer from a severe understanding deficit in these matters.