Duplicate e-mails

  12inches 12:21 03 Apr 05

On Feb 8 BH34 advised how to resolve problem of duplicate mail. Does the advice apply to Microsoft Outlook/Outlook Express or both?
Sorry to be thick but what is meant by turning off the e-mail reception for one of the accounts? (I assume this is a step to be taken before following items 1,2 & 3?)
I have checked that the box in the settings requesting copies of mail is not ticked.
Thanks for your help.

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