Hello There,
The way mentioned here in the forums is very good but I don't know why I failed to create backup. Though I used inbuilt tool of Outlook but it couldn't work for me. Then I discovered a software that helped me out to backup outlook 2003 emails. The software returned me the healthy PST file and made me safe from email loss. Later, due to virus attack I lost my PST file but thanks to the software that I was having the back up file. If anyone wants to create back up then can download this software.
Regards
Linda Briliance