Outlook email

A

aandj

We are new to Vista and Outlook email. We have 2 computers. When one laptop
sends email to the other, it sends it twice. It only happens within our own
computers. The computer that sends it, has 2 separate email accounts with 2
separate address books. However, the other laptop email address is in both
address books. Would this make a difference? If not, then what might be
causing the email address to receive duplicate emails only from the 2 email
addresses in the same house and not from other email addresses
 
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