Saravanakumar, you wrote on Mon, 19 Mar 2007 02:05:15 -0700:

i m using Microsoft Outlook 2003 . using one E-mail ID and one PST
file but I m using in 2 different Systems . mail are coming 2 copy
what is solution. i want one copy only

Uncheck the option "Leave a copy on server" (or similiar):

Tools | E-Mail-Accounts | Existing E-Mail-Accounts

There select the email account, click on "Modify/Change" and then on
"Advanced settings". On the Advanced tab you find the option.

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Best Regards
Christian Goeller
http://www.outlookfaq.net