Either delete them manually or use a utility such as OEX:
http://www.oehelp.com/OEX/Default.aspx
--
~Robear Dyer (PA Bear)
MS MVP-IE, Mail, Security, Windows Desktop Experience - since 2002
AumHa VSOP & Admin http://aumha.net
DTS-L http://dts-l.net/

Fred Evans wrote:
Importing messages from other computers has resulted in many duplicate
messages.

Is there a way to delete the duplicates?

best regards