Can I automatically imbed a "change date"?

[BigBlueMan]

I'm using Outlook in Office 2000 as sort of a home made sales tracking
system. Anytime I change some information in the overall Contact listing I
would like to automatically embed the current date in a field, so that I
could do a custom search, then sort by it and see what the latest calls have
been, who I need to see, etc.

Is there any way to do this?

Thanks!

ed