Outlook 2003 search function

How can I Outlook 2003 search more easily?

Advanced search can find the correctly subject mail but instant search "look for" search result quite poor on outlook 2003.

Too many result come out when using "look for"

Windows Desktop search + Add-in for Outlook saved mail indexing.

Any add-in can improve search on outlook 2003?

We don't want to upgrade to Outlook 2010.

Thanks.